Once again I had to hardware reset the router. Again, it was dying for a couple of hours stopping serving WiFi and dropping connections, and then failed to accept any external requests after reboot until HW reset.

Once again my my RB2011UAS-2HnD-IN router went unresponsive, similarly to described above 10 months ago. Again wasted so much time to realize that RESET button does not actually reset the device. The button is clearly responsive - when pressed device goes to "ether boot" mode forever. Ther...

I am answering my question above. This post was helpful and hardware reset with a screwdriver rather than button worked for me.

I have the same problem with my RB2011UAS-2HnD-IN. At some point the router stopped responding to Winbox connections. Yes I can see it on Winbox for a short period of time, the correct MAC, but trying to connect via MAC fails immediately showing "timeout error". ether2..ether5 - does not m...