I had a similar issue with an R10 pro half way through my run I would lose all bottom end and orange & green light were flashing according to manual this is sensor issue so I tried a new one and I didnt have the problem until the last couple laps.

So I switched out the LRP 8.5 for a Novak 13.5 and haven't had the losing bottom end problem but it is pretty gutless I think that is a motor problem well see I really hope I don't have a speedo with issues.