Im jailbroken and recently today after I left my phone on the charger it was tuck at the turn on apple screen. I unplugged it then it booted but after about 5 min of use if cuts off, and when I install stuff from cydia and enable flex tweaks. I restored the phone and re jail broken it but it keeps doing it. Any suggestions? do you know how to really really rest the phone, like deeper than a factory restore? I want to erase all previous cydia settings.