I have no experience of the HW speedo, but I have had the one channel or other symptom before.
I have an old brushed esc that was pre-lipo. So I have no low bat cutoff on the speedo. I try to be careful and ensure I stop the moment I feel the speed drop off. What I have noticed is that as the speed drops off, I can either steer, or accelerate but not both at the same time. I have put this down to the lipo running flat and is a useful guide as to when this occurs, my charger tells me I'm putting about 400mAH less than max in on the next charge.
How that helps you I'm not sure, perhaps your speedo low volt cutoff had failed.
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