[blade_x23]

I have a standard WE M9 Beretta but for some reason at random it seems to be going full auto or burst rather than semi all the time. Anyone got any idea on what I can inspect or repair to fix this issue? Is maybe a sear spring not strong enough or something? Looking for any input as I've been unable to figure out the cause at this point in time. I tried upgrading the hammer and recoil springs but even after swapping back to the originals it still occurs.