Hello
Sometimes my RB750G suddenly stops working. All ethernet leds go off, only the power led remains on. I can't connect to the router during this time. It comes back alive only after I unplug it and plug it back in. The log only mentions that the router was rebooted without a proper shutdown.
What could be causing this? Other equipment in the room are not acting weird so I don't think it's caused by power fluctuations.
Running RouterOS 4.16

Thank You

Firstly try the latest MikroTik RouterOS version 5.5 on your router.
Upgrade firmware to the latest version as well,
/system routerboard upgrade
/system reboot

Make sure RouterBOARD uses default configuration for /interface ethernet.
Do you know steps to repeat the described problem?

So far I was unable to manually reproduce the problem.
I'll upgrade RouterOS and wait for it to happen again, should it happen again.