I appreciate the response!
I'll definitely check out the harness under the seats tomorrow morning and let you know my findings. The power windows are getting fixed tomorrow by the dealer, so my guess is it was something easy that went wrong and they already knew about it.
The car ran for a solid day and a half with no issues. The car rarely dips below 14V, so for it to shut down as quickly as it does, I really can't figure it out. As soon as I turn the car on, I get 14.4V and when it shuts off, it's still at 14.4V.
As far as how the amp was installed, I have no idea. I had a pro do it (for warranty reasons) and apparently it didn't go so well. I am going to take it in tomorrow hopefully to get it looked at. I was thinking that the remote wire must have been hooked up wrong for it to constantly be on.