FS2004 Autopilot issue

[SWAFO]

CWS is Command Wheel Steering... to be honest, I'm not even sure if it's modeled in FS9... I believe the PMDG aircraft model it (some
other high quality addons might as well... not sure). This mode can be applied independently of the AP, or activated when force is
applied to any of the control axis' while in flight with the AP engaged. It's usually used for severe turbulence, as well as some other in-
flight manuevers. It basically allows us to set a desired degree of pitch and roll, and the AP will maintain this flight path until we manually
adjust it, or disable CWS... not too useful in reality.

So basically, you're problem is that the AP will hold the desired VS for a few seconds, then return to 0, correct? Is it possible that when
this occurs you have the altitude in the altitude selection window set to a value that is close to or below your current altitude (that is if
you're trying to climb... if you're trying to descend, it would be that you have an altitude set which is close to or above your current altitude).
I'm not sure what aircraft or autopilot (if you downloaded aftermarket versions of one or both) that you're using, and it could just be the way
the AP is modelled in relation to the altitude setting (if this is the problem).

I realize that probably confused the heck out of you, but I hope it makes some sense. I don't know how else to word it.