Hello, I think I have the exact same problem. I have several types of shelly (1v3,1pm, 2.5, em), and the only one I have this problem with is shelly dimmer 2. The firmware version is 20211109-131033 / v1.11.7-g682a0db. Initially, I thought it was a problem related to a rapid spike on the SW1 pin causing state changes. So I tried to increase the debounce time to 200ms but without results. The only difference between our configurations lies in the wiring. Having less than 10W of load I am using neutral wiring. Were you able to solve the problem?