[Conor Ryan]

Also make sure you have a good electrical circuit, a bad wire could be the root of all this. How did you run the shifters much before you started having problems with them? If you did with no problem, before hand check and make sure everything is symmetrical on each side from a mechanical aspect, you might have a buildup of gunk on the shifter shafts, also check to make sure nothing is inside the dog gear itself. Its more likely that you'll have a mechanical problem here over a programming or electrical issue.