So, my Preferred Network Type on my Evo is constantly switching to GSM auto (PRL) and this is really draining my battery. I searched for a long time to figure out how to fix my bad battery, and found the fix to set it back to CDMA auto (PRL) as it was originally defaulted on GSM. But now, it doesn't stick to CDMA and my battery is awesome whenever it's on CDMA, but sometimes I notice it going down fast, and I check, and it's on GSM again. How do I get it to STICK TO CDMA? This is so frustrating because this shouldn't be happening at all!