phone keeps freezing and shutting and it"s draining the battery

the phone just had a software update and ever since it keeps shutting off and turning back on and it drains the battery every time it comes back on. It keeps freezing up and I can"t disconnect a call or text or play any games. It"s very frustrating

from Android Forums at AndroidCentral.com - Ask a Question //forums.androidcentral.com/showthread.php?t=765782&goto=newpost
via IFTTT