Hi Bill, I own a 2022 2670MK and experienced this same problem. I'm an electronic engineer and did a deep dive to troubleshoot - long story short is that the previous posts are correct - when the TV extension motor hits the limit of its travel the motor stalls and draws lots of current (until the switch is released by the user). This large current, even for a brief moment, causes the voltage on the circuit/wiring which supplies power to the motor to drop (due to resistance in the wire from the fuse box) - something usual and expected for this type of motor application. Root cause of the problem: GD made a design mistake by connecting the Jensen receiver/clock to the same circuit/wiring, the voltage drop caused by the motor stall, if enough, causes the Jensen to power off momentarily which resets its clock. Very frustrating!
Here's the fun part: in my trailer the problem was very intermittent and our first camping ventures were relatively cold-weather. I could not get the problem to reproduce during these trips. Nor could my dealer's service department reproduce the problem (all my service appointments happened to be in cold months). Later during a warm (hot) weather trip the clock reset occurred every time we raised/lowered the TV. The explanation is simple - the resistance of the 12V wiring from the fuse panel to the TV cabinet increases at higher temperatures. The higher resistance causes more voltage drop when the TV motor stalls, enough voltage drop to cause the Jensen receiver to power off (resetting the clock).
I took detailed measurements and made a video demonstrating the problem (in warm weather), and sent all of it to GD customer support. My trailer was still within warranty so I requested that a new circuit/wire be run from the fuse panel to power the Jensen receiver separately. I had to push a bit but not too much, eventually they authorized my dealer to run a new circuit/wire under warranty (they had to open up the underbelly to route the wire, something I was glad to avoid doing myself).
A non-warranty solution might be to reconnect the TV motor to a different circuit in the kitchen slide out - perhaps easier to do than running a new circuit/wire all the way from the fuse box. But the other circuit in that slide out I think includes the over-range fan, so there might be some small chance of blowing the circuit fuse if running the TV motor when all the other lights & fan are on in the kitchen area (my guess is that blowing the fuse would be unlikely since the TV motor stalls are only very brief). Or the Jensen could be connected to that other kitchen circuit - though it might not be ideal to have the receiver (a sensitive audio device) on the same circuit as an electrically noisy kitchen fan. But worth experimenting to see if either of these easier wire runs would work.
Hope this information helps!
