Is anyone else experiencing this?

The plane captures the GS alright and starts descending correctly. However, at about 500 feet the plane starts descending at about 300 feet per minute and you end up high on the approach. I then have to disengage the AP and hand fly it further. Only once has it taken me down the GS correctly

I tried 3 coupled ILS approaches in the BS King air today, at around 400 ft it stated going below the glide path, varying from half to full scale fly up for me. The autopilot still got me to the runway okay, and at 50 ft I disconnected the autopilot and landed normally. So it seems that the BS autopilot does have problems following the glide path below 300-500 ft, but as the decision height for a CAT 1 ILS is 200ft or above, disconnecting the autopilot around 500 seems a reasonable workaround, although it should do a better job.