I am running ROS 7 beta 3 on a hAP mini for testing and am experiencing a memory leak. It is basically the default configuration but with firewall rules removed, OSPFv2 and OSPFv3 neighbor relationships established with my ROS 6.45.7 device, and DHCPv6 PD client grabbing a prefix from my main ROS 6.45.7 device for use on the bridge on the hAP mini. wlan interface is disabled on the hAP mini.
As a result of the leak it becomes unresponsive every 2 days approximately and I either have to reboot it or the watchdog reboots it.

Config is here:

[admin@MikroTik] > /export hide-sensitive
# nov/07/2019 21:09:00 by RouterOS 7.0beta3
# software id = XXXXXXXXXX
#
# model = RB931-2nD
# serial number = XXXXXXXXXXXXXXX
/interface bridge
add admin-mac=74:4D:28:XX:XX:XX auto-mac=no comment=defconf name=bridge
/interface wireless
set [ find default-name=wlan1 ] band=2ghz-b/g/n channel-width=20/40mhz-XX distance=indoors frequency=auto installation=indoor mode=ap-bridge ssid=MikroTik-XXXXXX wireless-protocol=802.11
/interface list
add comment=defconf name=WAN
add comment=defconf name=LAN
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
/ip pool
add name=default-dhcp ranges=192.168.44.10-192.168.44.254
/ip dhcp-server
add address-pool=default-dhcp disabled=no interface=bridge name=defconf
/routing ospf instance
add name=OSPFv2 router-id=192.168.44.1 version=2
add name=OSPFv3 router-id=192.168.44.1 version=3
/routing ospf area
add area-id=0.0.0.0 instance=OSPFv2 name=Backbone
add area-id=0.0.0.0 instance=OSPFv3 name=Backbonev3
/interface bridge port
add bridge=bridge comment=defconf interface=ether2
add bridge=bridge comment=defconf interface=ether3
add bridge=bridge comment=defconf interface=pwr-line1
add bridge=bridge comment=defconf interface=wlan1
/ip neighbor discovery-settings
set discover-interface-list=all
/interface list member
add comment=defconf interface=bridge list=LAN
add comment=defconf interface=ether1 list=WAN
/ip address
add address=192.168.44.1/24 comment=defconf interface=bridge network=192.168.44.0
/ip cloud
set ddns-enabled=yes
/ip dhcp-client
add comment=defconf dhcp-options=hostname,clientid disabled=no interface=ether1
/ip dhcp-server network
add address=192.168.44.0/24 comment=defconf gateway=192.168.44.1
/ip dns
set allow-remote-requests=yes
/ip dns static
add address=192.168.88.1 comment=defconf name=router.lan
/ip firewall filter
add action=accept chain=input comment="defconf: accept established,related,untracked" connection-state=established,related,untracked disabled=yes
add action=drop chain=input comment="defconf: drop invalid" connection-state=invalid disabled=yes
add action=accept chain=input comment="defconf: accept ICMP" disabled=yes protocol=icmp
add action=accept chain=input comment="defconf: accept to local loopback (for CAPsMAN)" disabled=yes dst-address=127.0.0.1
add action=drop chain=input comment="defconf: drop all not coming from LAN" disabled=yes in-interface-list=!LAN
add action=accept chain=forward comment="defconf: accept in ipsec policy" disabled=yes ipsec-policy=in,ipsec
add action=accept chain=forward comment="defconf: accept out ipsec policy" disabled=yes ipsec-policy=out,ipsec
add action=fasttrack-connection chain=forward comment="defconf: fasttrack" connection-state=established,related disabled=yes
add action=accept chain=forward comment="defconf: accept established,related, untracked" connection-state=established,related,untracked disabled=yes
add action=drop chain=forward comment="defconf: drop invalid" connection-state=invalid disabled=yes
add action=drop chain=forward comment="defconf: drop all from WAN not DSTNATed" connection-nat-state=!dstnat connection-state=new disabled=yes in-interface-list=WAN
/ip firewall nat
add action=masquerade chain=srcnat comment="defconf: masquerade" disabled=yes ipsec-policy=out,none out-interface-list=WAN
/ipv6 address
add from-pool=IPv6 interface=bridge
/ipv6 dhcp-client
add add-default-route=yes interface=ether1 pool-name=IPv6 request=prefix
/ipv6 firewall address-list
add address=::/128 comment="defconf: unspecified address" list=bad_ipv6
add address=::1/128 comment="defconf: lo" list=bad_ipv6
add address=fec0::/10 comment="defconf: site-local" list=bad_ipv6
add address=::ffff:0.0.0.0/96 comment="defconf: ipv4-mapped" list=bad_ipv6
add address=::/96 comment="defconf: ipv4 compat" list=bad_ipv6
add address=100::/64 comment="defconf: discard only " list=bad_ipv6
add address=2001:db8::/32 comment="defconf: documentation" list=bad_ipv6
add address=2001:10::/28 comment="defconf: ORCHID" list=bad_ipv6
add address=3ffe::/16 comment="defconf: 6bone" list=bad_ipv6
add address=::224.0.0.0/100 comment="defconf: other" list=bad_ipv6
add address=::127.0.0.0/104 comment="defconf: other" list=bad_ipv6
add address=::/104 comment="defconf: other" list=bad_ipv6
add address=::255.0.0.0/104 comment="defconf: other" list=bad_ipv6
/ipv6 firewall filter
add action=accept chain=input comment="defconf: accept established,related,untracked" connection-state=established,related,untracked disabled=yes
add action=drop chain=input comment="defconf: drop invalid" connection-state=invalid disabled=yes
add action=accept chain=input comment="defconf: accept ICMPv6" disabled=yes protocol=icmpv6
add action=accept chain=input comment="defconf: accept UDP traceroute" disabled=yes port=33434-33534 protocol=udp
add action=accept chain=input comment="defconf: accept DHCPv6-Client prefix delegation." disabled=yes dst-port=546 protocol=udp src-address=fe80::/10
add action=accept chain=input comment="defconf: accept IKE" disabled=yes dst-port=500,4500 protocol=udp
add action=accept chain=input comment="defconf: accept ipsec AH" disabled=yes protocol=ipsec-ah
add action=accept chain=input comment="defconf: accept ipsec ESP" disabled=yes protocol=ipsec-esp
add action=accept chain=input comment="defconf: accept all that matches ipsec policy" disabled=yes ipsec-policy=in,ipsec
add action=drop chain=input comment="defconf: drop everything else not coming from LAN" disabled=yes in-interface-list=!LAN
add action=accept chain=forward comment="defconf: accept established,related,untracked" connection-state=established,related,untracked disabled=yes
add action=drop chain=forward comment="defconf: drop invalid" connection-state=invalid disabled=yes
add action=drop chain=forward comment="defconf: drop packets with bad src ipv6" disabled=yes src-address-list=bad_ipv6
add action=drop chain=forward comment="defconf: drop packets with bad dst ipv6" disabled=yes dst-address-list=bad_ipv6
add action=drop chain=forward comment="defconf: rfc4890 drop hop-limit=1" disabled=yes hop-limit=equal:1 protocol=icmpv6
add action=accept chain=forward comment="defconf: accept ICMPv6" disabled=yes protocol=icmpv6
add action=accept chain=forward comment="defconf: accept HIP" disabled=yes protocol=139
add action=accept chain=forward comment="defconf: accept IKE" disabled=yes dst-port=500,4500 protocol=udp
add action=accept chain=forward comment="defconf: accept ipsec AH" disabled=yes protocol=ipsec-ah
add action=accept chain=forward comment="defconf: accept ipsec ESP" disabled=yes protocol=ipsec-esp
add action=accept chain=forward comment="defconf: accept all that matches ipsec policy" disabled=yes ipsec-policy=in,ipsec
add action=drop chain=forward comment="defconf: drop everything else not coming from LAN" disabled=yes in-interface-list=!LAN
/ipv6 nd
set [ find default=yes ] advertise-dns=yes
#error exporting /ipv6/route/rule
/routing ospf interface
add area=Backbone network=192.168.88.0/24
add area=Backbone network=192.168.44.0/24
add area=Backbonev3 network=ether1 network-type=broadcast
add area=Backbone cost=15 network=ether1 network-type=broadcast
#error exporting /routing/policy/selection
/snmp
set enabled=yes
/system clock
set time-zone-name=America/Regina
/system logging
add disabled=yes topics=ospf
/system ntp client
set enabled=yes
/tool graphing
set store-every=24hours
/tool graphing resource
add
/tool mac-server
set allowed-interface-list=LAN
/tool mac-server mac-winbox
set allowed-interface-list=LAN