Recently I moved into a new flat in the dorm and faced a problem with LED-mirror-panel in the bathroom and asked the landlord to fix the problem. Despite the responsible maintenance electric company came and took out the panel and fixed the problem and installed it on 03.02.2021, after 24hrs again, I faced the same problem. The LED set in a border of mirror panel hasn't worked fully. As you can see, just the left side is working:
Other electrical information can help to resolve the problem is the following: The bathroom lighting has one Ceiling-bulb, and LED-mirror-panel on the wall. Both can switch on/off via double-switch as you can see in the picture.
I already checked this and could be power supply problem in LED-mirror-panel, and this answer. This answer that addressed to LED characteristics encouraged me to be patient to see the right side of the LED-mirror-panel could work one day.
Any help reflecting issue to the landlord or the responsible maintenance electric company will be highly appreciated.
Update: I realized that my next-door neighbour has also the same problem. Could be a faulty phase problem?