Need help: Stereo randomly loses sound except for sub,

[cmb396]

2018 JLUR, with complete non factory set up. JL C5, or C2 speakers in dash with 6.5" in knee panel and overhead, all ran my JL MX 500/4, dash are ran off the head unit I believe? I believe JL RD 500/1 running the JL stealth box?!
The stereo randomly cuts out all noise except to the sub. Almost invediably happens after reversing, but not always. I can change am to fm to sirius, to phone, and nothing works but turning the jeep off, opening the door, and restarting. Which is a pita when in town or interstate!
This was all happening with the 7" Uconnect, so I had a Stinger installed hoping this would correct the problem, it did not, still have the same issue.
Any ideas or similar experiences? I did not do the install, local shop did, and cannot figure it out either. If anyone has ideas, but needs more info on the setup, let me know and I can get details on what other components were used.

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[cmb396]

Bump, any ideas of how the stereo could be tied into reverse? Seems to happening more often now several seconds after backing out of a spot and driving forward.
Obviously, back up camera, but what could be causing all the speakers but the sub to cut out?

 

[thatsoutrageous]

Did you ever get this sorted? Same issue here. Wondering if I should just replace the backup camera even though it doesn't seem to have he common issues of disappearing lines or incorrect display.

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