Hi Larry - Just talked to my service tech last week about this & he said it is the keyfob receiver that is the culprit.
The receiver (located behind the dash cluster) allows programming for 4 separate keyfobs. Newmar programs #'s 1 & 2 to the fobs delivered with the unit but leaves #'s 3 & 4 unprogrammed.
They have found that when all 4 are programmed (they repeat 1 & 2 twice) this stops.
Programming is done by pushing the button on the receiver & then following a set of steps. To wit . .
Here is the procedure according to the data sheet from Marksman M2a Owners & Installation Manual (800-638-3600;
Magnadyne).
1. Remove dash cluster by removing 4 screws.
2. Locate box that has 2-wires comming out of it with a valet switch on the end (the tech says it is the only one up there like it - it sits on a wooden shelf.).
3. Turn ignition to 'on' (not start) & push valet switch 6 times (if done correctly horn will sound).
4. Push the lock button on the first fob & hold until horn sounds 1 beep.
5. Push the lock button on the second fob & hold until the horn sounds 2 beeps.
6. Push the lock button on the first fob & hold until horn sounds 3 beeps.
7. Push the lock button on the second fob & hold until the horn sounds 4 beeps.
He assures me that this takes care of the 'gremlin locker'. Since I don't have the second fob with me I'll have to wait until I get home to do this.
Good Luck.
Mark