Motor problems on my excavator?

[Azonic]

Hello guys,

I have recently noticed that my left track on my Vario excavator moves slower then the right one, but only in reverse, forward they go at the same speed, all my radio settings are equal to each other and that shouldnt be the problem.

Sometimes it glitches when im traveling, but only the left track.

Everything worked good the other day, but when i tryed it out after that it started doing this, my guess is either a bad motor on the left side or maybe my reciver is bad, i have lost the 10th channel on it, maybe the channel for the left track is bad as well, or the track esc is doing this, its a Saberthooth 2x25, i run a 11.1v lipo.

Any ideas what could do this?