What reboot frequency did you have previously?
One to multiple times in a 24HR window.
Mikrotik support wanted me to turn off watchdog and log error / generate supout.rif once locked. The generated supout.rif files I provided after the watchdog reboot didn't yield any useful information. I opted to netinstall the latest long term release track (6.44.5). We also replaced all the SFP modules as a precaution during the maintenance window.
Mikrotik Support's Recommendation:
What's new in 6.45.6 (2019-Sep-10 09:06):
Before that, I suggest that you upgrade to the latest "stable" version (if there is an actual bug, then it might be already fixed). For example, v6.45.6 fixes a Watchdog reboot caused by h323 firewall helper. If your router did process voice call traffic, then the issue might be already resolved.
*) conntrack - improved system stability when using h323 helper (introduced in v6.45);
These are our edge routers and no NAT is being performed and we don't use h323 internally, but if some malformed h323 packet traversing these routers was causing the reboot then this may have been the cause behind the sporadic reboots. Again I'll post results of the downgrade to the Latest Long Term Release track after ample time has passed. So far ~15hrs and no reboot, this won't be conclusive until we make it past the 24-48hr mark. From what other users above have posted I'm feeling optimistic.