Dell Laptop freezes or stops responding ever now and then.

When it freezes , the screen is still on but the mouse doesn't move.

when it stops responding , the mouse moves normally but with a blue circle "loading sign" and nothing responds.

things i have done and still the issue is not resolved:

1-i have run diagnosis and no problems were found except with optical drive (the CD drive makes a noise every now and then)

2-i have run file checker (sfc / scannow command)and there were corrupted files and were resolved

3-i have installed windows update.

PS: Power button doesn't work to forcefully shut down the laptop when freezed.