I did an over under interval 90 minutes 5x9 minutes and at the begining of the 4th interval interval timer stop ( i use an iPad mini 2, tunein app play radio in the background but i did not quit from trainerday app), it shows low cad , hr and power data and those did not change. I turn off bluetooth and paired again, the app was very very very slow, but did not help. I closed the app and open again, WO was there i could continue, but the problem was the same and interval timer counts changed only every 2 seconds. After a few minutes i figured out that pause and resume helped but only the end of that interval, in next interval times counts 2 seconds steps and cad,hr,power was frozen, but by feel it was ok, so bluetooth should be ok, erg worked and changed power. So i finished WO and start again and finish the 5th interval without problem.
Could you tell it was a SW issue? I think BH was ok, because by feel erg worked, but display was wrong. And the WO diagram was