I have been using an FES since mid December, 2 1/2 months. The power level has been set to 50% and I have been walking almost normally. Suddenly it stopped working at 50% , I tried new electrodes but no good. The only solution was to increase the power to 70 - 80/% to get the response to the muscle that I was getting before.
This all happened quite suddenly. Does anyone have any idea what is going on and what I can do about it?