My monitor screen keeps turning off randomly and all the buttons are not responding when the problem occurs.

Problems:
- Monitor random shuts off but the power led light is on.
- No display or back light.
- Monitor Freezes
- All buttons are not responding.
- Needs to be unplug to turn it on

Actions I made:
- Changed them, DP wires and Adapter - the problem still there
- Went to a repair shop and it seems they found no issue. I dont know maybe they just dont know how to fix this monitor.

Warranty already expires.


My computer is completely fine. No errors and etc. Other monitors are working.


can anyone help me with this problem?