I doubt it is the lipos as they are just a power source, if the speedo light is on then the power is flowing.
It could be the transmitter becoming unbound or not sending a signal out to the reciever hence the light going off. does the transmitter have the same issue with your TC?
Also check the aerial position, mine is very close to the main battery cables and the car would cut out occasionally, I pulled some more wire through so it was coming out of the top of the tube and it seems to have cured it.
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