i decided to do a fresh restart of my phone so i poewred it down, and did a battery pull after the phone was completely off. turned it back on, gets to lock screen, i unlock......sits..loading...screen goes black, and whattya know, white HTC splash screen. a few times. it's bootlooping!
Basically, with the cover off, it stopped bootlooping..therefore, it was a NETWORK ISSUE.
EDIT* this WORKED! anyone who has this issue please do the following: (source http://www.droidforums.net/forum/htc...boot-loop.html)
STEP 1: TAKE BATTERY COVER OFF. this will prevent the phone from trying to connect to the network.
*#*#4636#*#* Under phone info you will find that the network is factory set to WCDMA Preferred... I guess the SIM card decides sometime along the way that it doesn't like that much... Setting the network to CDMA EVDO/LTE - Auto completely corrects the problem
another poster said that after you do this, hit home, power down the phone, pull sim card out, put it back in, then reset it. i didn't do this; i just went back, put the battery cover on, it froze like usual, reset itself, and now it's working perfectly.
**UPDATE** A few people are saying that along with taking off their battery cover, they have to REMOVE THEIR SIM CARD AS WELL! i did not have to do this, but some people did. take that into consideration!
You may have to take your SIM out for this to work. I did even with the back off. Aside from that, this works fantastic.)
for some reason, this is what happens: under phone info, as it says, it will reset to WCDMA Preferred for NO reason whatsoever! this must have happened when i shut my phone down; other people are reporting that doing "reboot" does this frequently for them! this is the first time in my month of ownership i saw this happen, so this was new to me...but thankfully, we have a fix!
As another way of doing this, Marclile said:
"For anyone interested, you can download this app and get straight into that config menu.
I use it to switch from "CDMA + LTE/EvDo auto" to "CDMA auto (PRL)". The CDMA auto setting doesn't seem to have the reboot problem, so you should be able to put it on that if you don't want 4G turned on all the time."