u/Quick-Protection-513

I installed a dtt 3 position frt in my Daniel defense m4a1 and it was running just fine for around 300 rounds. Zero issues. Last couple range trips it has started to fire multiple round bursts in semi. It was only every couple mags at first, but now it's almost every time I pull the trigger. Any ideas on whats causing it? I haven't changed anything about the rifle and after taking the trigger out it looks basically brand new. I am running an H2 buffer.