Assistive touch turns on and off randomly

Hi everybody,

I would like to ask for your help regarding this problem I have with my iPhone 8 64GB device.

Since the iOS 15.6 update, the assistive touch function turns on (or even off) by itself randomly, sometimes when I'm using the device, but even when I don't use it. When I turn it off, in a couple seconds it turns on automatically, and it also turns on when I press the home button to exit the settings after I disable it. I can not restore the previous release (15.5), because it's not signed anymore. My home button works fine, it does not have any issues, though it was replaced half a year ago because of a crack on it, so the TouchID does not work, but there were no issues until now. It's really annoying when it pops up so the phone just goes to the home screen instead of doing what I want. I've tried to restart the phone, going back to factory settings, etc.

If there is a way to turn it off permanently, it would also be fine, I just want to get rid of it.

Thank you for your help in advance.

Best regards,

Adam