Looks like I’m in the minority with 4iiii issues. My 6800 left arm worked fine for maybe 3 months and then would drop power readings if I stopped at all during the ride… I would calibrate it before taking back off but zero power readings. Then it got to where it would drop readings while riding, regardless of if I stopped or not. Yesterday I put a brand new battery in it, connected and calibrated, and never got it to give me any power readings at all. It’s been very frustrating to say the least.