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Some early models of the N5 had problems with run away slewing (scope takes off during
a goto and never stops) and hand control lockup, especially when using a computer to
control the scope. Some have claimed that low power (weak batteries) or a loose
power connector (see here for a fix) causes most run aways, but others feel it is more
likely a software problem. It is known that newer versions of the software
(firmware, technically) resolved the problems with computer-control related lockups as
well as most run away problems.
Unfortunately, the NexStar 5/8 cannot have it's software updated by downloading new
software via the RS-232 port. Instead either the hand control and possibly the
fork/mount need to be returned to Celestron for upgrading. If you feel you are
experiencing software related problems, you will need to contact Celestron to see what can
be done.
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