I have several P3s I use to pull a line up and over then draw a safety line when I work high. Recently I bought a P3s from a friend who was assigned overseas. His P3s was left idle for a year or so now the aircraft will not link to the controller. It is as new flown only a couple times, then left in storage for over a year. Now the aircraft will not recognize any 3 P3s controller I have. However, controller will link to my other P3s with no problem. I don't know but assume the aircraft may lose its configuration over time. Similar to a computer left idle if the main board battery goes dead in storage. Nothing I have tried has worked so far, I didn't pay much for the P3s so may just hold for parts. I like the P3s because its a good lifter it lifts my safety lines up easily.