Hello my Stamina reading have been erratic where it starts off fine but then all of a sudden drops to 1% for long periods and then up again all while at aerobic pace throughout and the same pace. This has been happening for the last month and it is becoming very frustrating. I have checked my heart zones etc and they are all correct. I am running consistent 100k weeks running every day so I have good data. Can anyone please help. I really want to use the stamina fields given the feedback from other runners but at present it is useless. 
