ping hotmail.com 'Ping request could not find host hotmail.com. Please check the name and try again.'

Mikrotik IP/DNS/flush cache..

ping hotmail.com... Reply from 204.79.197.212: bytes=32 time=6ms TTL=118'

I have to do this everyday I come on otherwise endpoints connected to internet via Mikrotik router can NOT resolve hotmail.com... Same happens with Outlook.com occasionally...

I use ISP DNS servers...

the outlook.com entry in the mt cache says
N outlook.com unknown 0.0.0.0 TTL 00:00:02

Okay.. so watching the MT cache table I came to discover that when I ping outlook.com from my PC the DNS entry for outlook.com gets added as unknown with 0.0.0.0
but if I wifi in to different vlan on same intranet it pings fine and the entries get added to the MT cache. Puzzled as to why..

Post result of /ip dns print

[admin@***] /ip dns> print
servers:
dynamic-servers: 59.86.160.27,125.213.172.129
allow-remote-requests: yes
max-udp-packet-size: 4096
query-server-timeout: 2s
query-total-timeout: 10s
max-concurrent-queries: 100
max-concurrent-tcp-sessions: 20
cache-size: 2048KiB
cache-max-ttl: 10s
cache-used: 295KiB
[admin@***] /ip dns>

If I ping hotmail or outlook.com from the MT terminal, I get a reply MOST times w/o failure... Puzzled still.
Then of course after that gets added to the DNS cache I can ping both from my computer and get a reply; no problem.

Somewhere a bad DNS entry is getting added for both hotmail and outlook randomly it appears... when that happens no reply
from neither hotmail nor outlook... not sure what to make of it...

Once the new BAD/FALSE entry gets added to the MT DNS cache then I get no response from any PC OR from the MT router via terminal window ping.
Is this an ISP issue or a configuration issue or something else...