Hammerli Xesse going full auto

I have an older Hammerli Xesse, with Larry's trigger, and it sporadically goes full auto, fires two rounds with a trigger pull. Obviously unsafe, wondering ig anyone else has experienced this and what was the fix? Thanks!

David

Checked your trigger bar disconnector to sear clearance?  If fire control group looks good then maybe a carbon ring built up in the chamber and slide slamming forward might be setting them off due to headspace.  Another thing to check is the firing pin to firing pin stop roll pin and spring, maybe developed a burr or binding and is locking the firing pin sporadically?