Hello. We are using OmniTIK U-5HnD with 3.22 firmware and 6.28 RouterOS. We have 15 clients with SXT connected to it using Station mode, OmniTik is in ap bridge. Sometimes, in random period of time , once in day/2days/week it wipes out all the clients from registration list. They are (2-3 clients at one time) trying to connect again, stands in registration list for a few seconds and then disconnecting again. Reboot solves the problem and after that clients connecting without any problem. We are disabled OSPF, gave them all static default routes to OmniTik but no luck. Watchdog now helping us out and reboots the router when we have a problem. Nothing interesting in logs, just disconnects and connetcs.
Any suggestions?

OmniTik might be on the way out

Is the Ap in bridge mode with RSTP on? Disabling the r/stp may help to faster reconnect. Maybe. Worth to try...