when you disable packages and restart - RouterOS - purges Firewall config.
also after EACH reboot[regardless you do otherwise] - RouterOS - reset Wifi mode[persistenty return to 20Mhz B/G/N mode from different ones(like 20Mhz 11Mbps/B or 5Mhz 2Mbps/B)].
NAT and quees are okay and untouched.
thats not funny :[