You probably have done this, but weak LC remote batteries will act like this. Changing triple A's is a lot simpler than trying the layout to find poor connections between sections. Not just voltage but high voltage is important.
I had a Universal Remote that kept losing signal, with fresh (the finest *** Hardware) batteries. I sent the remote to Lionel, who returned it saying nothing wrong, but "we don't recommend this brand of batteries". They hit the can never to return. Now, I change remote batteries at the first sign of signal loss, and only use name-brand cells. (Note: I have seen problems lately w/ D***C***s leaking.)
I THINK the TMCC system was FM; and the Legacy system is 2.4gHz. My "other" major hobby: racing RC model sailboats using 2.4 gHz radio.
1. One would think that the LC remotes have a minimal antenna in them because of their size. So, not holding the remotes up high enough - at say waist level or by a child at a train table - can be a signal-loss problem especially on LC and LC+ locomotives. (The TMCC/Legacy control system relies on antennas in the loco for receiving signals- the TMCC ground relies on the track connection through the power plug ground prong and the house wiring).
2. As above, weak batteries in Lion Chief remotes and Universal Remotes.
3. Antenna not extended far enough on TMCC Cab 1 remotes- this affects certain locos more than others.
4. AC voltage to the track, when using a transformer- pretty much 15v is needed, and I have found myself with the ZW set too low sometimes. Affects performance and smoke unit output.
