Unfortunately, I know of your situation personally.
The problem is in 2 different areas of the gun concerning the torque bolts vibrating loose after many rounds of shooting. Blue Loctite has been the only solution for me to work, but it is very scary when the problem occurs.
http://www.brownells.com/schematics/Ber ... 455sid1062
Part 96 on the forearm Latch assembly.
and I believe
Part 36 that hold the upper part of the trigger group to the lower part.
Anyway, I have discovered that these 2 bolts SHOULD NOT ever be exposed to any synthetic lubricants like Q20 or other synthetic oils. If they do, they will constantly vibrate loose and cause the gun to come in 2 halves as you describe.
Solution:
Disassemble these 2 bolted areas. Completely dry them, Reassemble to proper tension and apply a small drop of Blue Loctite. I have been to 2 gunsmiths and this has ended being the only solution for this problem.
I am not a big fan of the new forearm latch assembly as it has proven to do this on many occasions. Seems to always happen during the middle of a tournament. Imagine that!
The forearm latch on the 682 is much sturdier design in my opinion.
Anyway, you are not alone in this problem.
For further reading, These guys seem to be having the problem as well:
viewtopic.php?f=57&t=406618
and
viewtopic.php?f=95&t=399372
and
viewtopic.php?f=245&t=378235
and
viewtopic.php?f=57&t=403820
and
viewtopic.php?f=245&t=399653