Does not recover after inactivity
I have a problem with my s4.
At random intervals my s4 after inactivity and therefore black screen cannot open again, meaning I press the power and the central button but the phone is unresponsive.I need to press the power button for some seconds in order to close and then restart again.
Any ideas?Is there a hybernation mode of some kind that I can remove or there is a problem with the phone?
The last time it took place I noticed a purple led going on and off if that helps.
I appreciate all the help