HTC One M8 boot loop? topic

My HTC One M8 keeps booting to the Cyanogen Mod splash screen or boot animation, and then just restarts. . . It does this infinitely. I can access my custom recovery (TWRP) and bootloader mode. I've tried reflashing, wiping, different versions of CM and nothing works. I have a backup of stock HTC sense 6 rom that works perfectly. I really want CM11 or CM12 to work but it just keep rebooting! And yes, I am flashing the boot.img whenever I flash a Rom.

Any help, thanks!

S-On
HBOOT - 3.16.0.0000
RADIO - 1.05.20.0321_2
And I'm on sprint.