I also suffered two lock-ups with the FM-2. One as I hit the trigger, the second was when I went to lower the landing gear. I was really annoyed with the lock-up as I fired, because I had just killed a Typhoon, and had perfect position on a second one.
I also had a lock-up in an Osti that cost me 6 kills. Discos like those make one a bit unhappy. However, I'm sure they will sort it soon enough.
My regards,
Widewing