I have a pair of 3 year old yn-622 mark 1 triggers. One of them started acting up recently. I mount it on my camera and am able to change an off camera flash's setting on my camera. But I am not able to fire the off camera flash. I replace it with my other yn622 trigger and it fires the off camera flash. I tired to factory reset the trigger, replace batteries etc. nothing helped. I am wondering if anyone else has run into this problem before and if there is a way to fix it?