No Rep
Since the good rep Genie had went to work for Cat Rental they hired another guy that only lasted a few months but that is ok because he never knew anything anyway.
4950 is old. Are you loosing control with all joysticks at once or one at a time?
If all at once it is most likely the foot switch time out. It comes factory set a 2 minutes how ever it can be adjusted to 0 seconds, 10 seconds, 2 minutes or 10 minutes. If the operators try to block the foot switch that is when this really shows up. It also shows up when the the weather changes, the enviroment is such that the footswitch gets stuck due to contamination.
Due to the way the circuit is wire I have even had similar issues due to poor wiring or even a bad key switch do you have access to the webGPI software?
10,000 light towers seriously, that would be almost 4 years worth of the full product capabilities of thier factory. What light tower issues did you have? What was the model number? On GEnie towers or Amida/Terex towers?