hello guys.

when i switch between apps, after i use one for some seconds , around 5, the one that is supposed to be working on the background closes by itself.

for example, i am using chrome for win 8.1 and when i switch it , sliding it using my finger,  to skype and chat for more than 8 secs i think and i slide back to chrome i find it as if it was never opened and my tabs closed, this also happens the other way, when i use chrome and skype at the same time skype also restarts if i am using chrome for some secs, 

any ideas please? :(