When network is scanned first time, the HP CM1415fnw printer (wired connection, not wifi) mistakenly defined as supporting RouterOS device.
This cause including "routeros management" probe to the list of active probes.
And, finally, this cause printer to restart every 10-15-20 minutes.
When "routeros management" service removed (actually, disabled) from the list of "supported" - printer stops to restart.
I have disabled this service, instead of removal, due to it is automatically re-appear if I have just removed it, do not know why...
Confirmed twice, on The Dude 6.49.2, and, after update (problem comes back), on 6.49.3.