I have a Droid DNA and suddenly the phone has turned off for no reason, when I turned it on again, it frezees in HTC boot logo "blablabla development blablabla) and restarts and it keeps in a bootloop, I can enter into fastboot, so I put it on to charge it, and 15 minutes LATER, i tried to turn it on again, no luck, so i put it into usb mode, and booted and it can boot normally, but when I quit the usb the phone turn it off and goes again in this crazy bootloop, also I cannot enter into the recovery mode (I installed TWRP and tried to enter but it freezes into in blue logo), and again I put USB on (No charger) and it enters, I flash a ROM and reboot, but when I disconnect USB CORD (NOT CHARGER) it turn off and again comes the bootloop crap, so I think its the battery but I opened the phone and I dont see a sign of battery death (like inflated) so I dont know if its a battery problem or a motherboard problem? What should I do? buy the battery or have a nice red brick? help me please.
Sorry for bad english Im not American.