Second phone, same problem

So, my first phone was jailbreaked, worked fine but one day it turned off and wouldn't turn on for some time, even if I tried many combinations of home and sleep button. Happened few times, had some red screens and in the end it didn't turn on at all.

I got a new phone like week ago and already happened second time that I had to hold home + sleep button. I'm worried it's gonna happen with my new phone, too. Any ideas ?

I also bought a new charging cable and charged it only 4 times, always through my pc

Seems its not turning off because when I hard reset it, it only wants iphone pass, not sim