Shelly pro 4pm problem break

Hello,

i connect shelly pro to one contactor or any motor with reel, when switch turn on everything is ok, when switch turn off shelly break and restart every time. I dont understand the problem.

I need use any filter? the motor send any interference to back?

i use this to protect shelly and the problem is same:

https://www.hager.pt/ecatimages/pdf/ERC225.jpg

firmware version: 0.9.1

thanks for help

thank you thgoebel

if i understand the solution is connect one snubber beteween A1/A2 ?

[Blockierte Grafik: https://i.ibb.co/zRvjRb2/ERC225-soluc.jpg]