Lester ...is this your Gemini 1? You have the Titian with Maxon motors.
I repaired this back in Apr 2013, RA motor lags, stalls, replaced RA "H" bridge.
If you have not used it since and it is not working return it and I will certainly consider that this is an issue that I should look at for free.
But first, have you changed the battery and re-installed your Titian settings?
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