2011 nitro, remote start

2011 nitro r/s viper 5901 and chall bypass. everything works fine easy install then customer brought back cuz not starting anymore. i unplug bypass and alarm plug back in and started wrkng fine cust left  called back 2 hours later same thing. any ideas

thnx in advance

Is that TIPStart, or Regular fobkey?

Did you try calling DEI?

I would use a PKUMUX if it was reg fobkey.

reg remote on the key. was easy install plug n play. maybe needs software flash update?  but if that is the case y does it work at all then?

thnx in advance

I had this same issue on a Dodge heavy duty truck. Spent half a dozen appointments trying to track this down, pulled the brain antenna and remote and sent them to DEI to try to reproduce the issue and they couldnt, uninstalled everything, re wired in new harnesses and still no solution, switched the unit to a 5701 2 way LED and the problem went away. DEI said that there had to be something in the vehicle causing the issue but the truck was completely stock. At the end of the day I never found a solution, if you figure your problem out let me know.double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer