ST-402 woes

I'm having trouble with a ST-402 camera with BVIC filter wheel.  Basically, if I ever try to use the B filter, the filter wheen gets lost and the camera is useless until I disconnect it and re-connect it (which I don't do).  It works fine as long as I stick with any of the V, I or C filters.  I've emailed SBIG but I'm wondering if anyone else has experienced this problem?

Jim Roe [ROE]