This seems to occur very often when you set the minigun to fire frag grenades and crouch. By very often, I mean about every 30 seconds or so I become crouch-jammed and unable to fire. My Soldat does not animate, though I walk and "slide" at extreme speeds.

Crouchfloating?

Yes, though whether or not its the weapon's fault, it seems to be taken to a real extreme for some reason.

I see it as 1 of the 'cool' bugs really.. And it's not hard to get out of at all, just go prone.. I wouldn't pay much attention to this to be honest..

Normally its not an issue, and with such an extreme weapon I guess it doesn't matter, but the only thing that bothers me is that it happens every 15-30 seconds, not just once or twice a day.

I have been able to get into the crouch float much easier with modded guns :P As well the backflip allows you to go into a crouch float too...

I've been getting into a rouch-float a lot more in 1.2.2a more also.