95 Stratus Transmission

95 Stratus with 116.000+ miles. In January the transmission started to fail into limp mode. The shop has changed <several times, the solenoids on the transmission. They have taken the wiring harness apart looking for shorts. They have worked with all of the connecters to the transmission. They say the problem is electrical but they are unable to find the problem. Factory Engineer also says it is electrical and suggested adding more grounds. None of this has helped. Sometimes a restart will allow the transmission to function for a few miles then if fails back into limp mode. Any help would be greatly appreciated. Thank you.>