SRW2048: ports 13-18 and 37-42 (third bank) are locked

Hi-
Just bought two SRW2048 switches and have a problem with the third bank (ports 13-18 and 37-42) on one of them. All ports in this bank, no matter whether the cable is connected or not, are yellow. Upgrading firmware to the latest 1.2.2 didn't help. Resetting the switch to default settings did help but for some short period of time. I see no errors in logs and only mentioned ports are affected. The second switch is OK as well.
Does it look like a hardware issue?
Any hints would be greatly appreciated!

Thank you.
Tried to power it off tonight and noticed that ports in question went back to normal. It works OK for the time being, but this was the case before -- it used to work fine for some time and then all ports in the third bank light up with yellow. Strange, seems to be a software issue or it has something to do with the load...

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SRW2048: ports 13-18 and 37-42 (third bank) are locked

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