Hi - There's another person having a similar wireless connectivity issue as you and I posted the following response to him.........it appears likely you have the same issue with a defective 2.4GHz Navigator transmitter board.As A continuation of this. I gave my unit to my son and he has managed to do a firmware update on the central station and he has done a firmware plate on the handset. Success in one department the trains now run in the tetherd mode (wire between hand controller and centeral station) but the wireless mode has stoped working when unteatherd and switches on the handset just says No connect?
any ideas guys, is it new firmware and old trnmitter or has the updating changed something else?
"Try going through the Manual's process to set up your second Navigator using the cable connection instead of wireless and see if it works okay. If so, then it's likely a defective transmitter board. You could also take the transmitter board out of the your operating Navigator and insert it into the problem Naviagator and I think you'll find the defective Navigator works. If that's occurs then you're sure the transmitter board is the problem. I sold two Navigators to customers which I bought from my distributor in Germany about two years ago and they both developed wireless connectivity problems. The customers returned the Navigators to me and I installed two new transmitter boards and they then worked flawlessly. I returned both of the defective transmitter boards back to Germany for warranty support and still awaiting their shipping me two replacement boards.......their warranty service has been slow during the Covid-19 pandemic."