Ultron troubles

_slippery_pete1

I run a aq team which has 2 ultrons in it. A 4* and a 5*. So ive noticed 3 times today in aq my ultron hasn't gotten his regeneration at all. I was not stunned at any of the times when it should have kicked in or on anyone that had a no heal node or path. Im just wondering if theres somthing im missing. Did you guys take his regeneration away? Just trying to figure out whats going on