Laptop goes to sleep by itself while in use

[coldrain]

This has happened several times during the last few days. My laptop goes to sleep by itself randomly while I am actively using it. The model is Dell XPS L502x.

Thanks in advance!

 

[coldrain]

It seems that this happens only after resuming windows from hibernation. After a fresh restart it stops going to sleep mode. But after i resume from hibernation it stats happening again.

Any thoughts?