Power is always good to have at full voltage, but it doesnt sound like a power issue as you didnt mention if range was the issue (ie. the car always fails to respond at the furthest point on the track)
So assuming range isnt the issue, I would think that it sounds very like interference on the 2.4 spectrum.
Different RX/TX use a different number of points within the spectrum to hop around (hence the Spread Spectrum name). If one or two of those points get interference, its not normally an issue and probably we wouldnt notice.
I wonder if you lost more than just a few of these points and got some major interference?
As I said, I think different brands might be more resistant to interference, so does anyone else race your brand at Southport and do they have issues?
Sorry - Im guessing too, but thats where I would start.
Good luck!
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