Default Changed recovery and now TF700 won't stop rebooting (makes it all the way to Android)

Hey guys, I was gifted an Asus TF700, unlocked with TWRP and an unknown ROM.

I was looking to upgrade the ROM so I tried putting Philz Recovery on the tablet by flashing the .zip in TWRP. Then I flashed a new ROM in Philz and here's where the problems start.

The tablet will boot all the way into Android, and I can use the tablet for anywhere from 10-60 seconds before it reboots. If left alone it would stay in this boot loop until the battery would die.

Now I just want to start over. I can't boot into recovery as hard as I try. It just stays at the Asus screen or restarts.

Any ideas?