Problem(s) Encountered:

In most slews, the telescope stalls partway there, and about half the time the tracking stops too.  With patience one can hop the telescope over to the target, but this obviously isn''t normal.  This doesn''t happen every time. Also, sometimes the telescope will stall repeatedly, and then on the last attempt execute a long slew flawlessly.  This is, of course, pretty strange.

Solutions:

The Preload was loosened up a bit and we tested the telescope and had no problems.

It  appears that preload needs to be checked when there is a dramatic drop in temperature.