Yep - this got resolved within a few weeks. Been super late posting an update. Sorry about that guys.
Daniel from OEM audio plus was there to help me troubleshoot every step of the way. Eventually sent the AMP back to them to test. They sent it back to me saying everything was working fine. Before fully installing the amp back in, I sanded down the ground that it was connected to and once all was reconnected the system fired back up. Can't say whether they did anything to the amp or if their suggestion to sand down the ground point did the trick, but definitely relieved and glad it all worked out. System is awesome and couldn't be happier with their customer service. Feel free to hit me up if any questions or concerns.
Daniel from OEM audio plus was there to help me troubleshoot every step of the way. Eventually sent the AMP back to them to test. They sent it back to me saying everything was working fine. Before fully installing the amp back in, I sanded down the ground that it was connected to and once all was reconnected the system fired back up. Can't say whether they did anything to the amp or if their suggestion to sand down the ground point did the trick, but definitely relieved and glad it all worked out. System is awesome and couldn't be happier with their customer service. Feel free to hit me up if any questions or concerns.