@minelson  did you ever get it figured out? I've encountered the same issue and just swapped the HS 220 v3 with another new HS 220 v3 and still have the same identical issue as you described. 
 

I have another HS 220 v3 in the wall about 3 inches away that I installed successfully about six months ago. They are on 2 different circuits though.

  @minelson Please let me know if you figured out a solution. I am having the exact same issue with the HS220 dimmer switch. I have tried 3 different identical dimmer switches and they all have the same issue. The non-dimming switches, plugs and bulbs I have installed around my house have never been an issue.