I have RB2011L-IN, and I have a problem with it.

The problem is definitely with versions 5.19 and 5.20


Problem: Random stop working ports 1-5 or 6-10. (All ports have configured in bridge.)
At the time of the issue reports MikroTik connected devices at ports, but there is no transmission. It helps to restart (but not always), and the disable and enable of any port in the group - transmission occurs on all ports.

Is that a problem firmware / firmware or damage to the equipment?

At the time of problem, connect through one of the working ports, and make a supout.rif file, and send to support@mikrotik.com

We have not heard about similar issues, so we need the file to see why this happened to your device.

Already sent a notification : Ticket#2012082066000212

Tomorrow I change the device to a different RB2011L