Hello everyone. I have the same problem from two days ago. My Samsung S4 suddenly switches off and turn it on, then off again when the Samsung logo appears S4.
If I connect it to the charger, the battery icon totally black and after a few seconds the battery charging icon appears. It is in these times, always with the charger, when I turn the phone without turning off again.
I have no removable memory, so do not think it's the same problem I had Andrew.
Please if anyone knows how to fix this problem.
Sincerely,