I've had this happen occasionally - an intermittent fault...don't you love those!?
I checked balance, shut down and restarted PHD and it worked.
...also try the Autoguide speed as vash said - default setting is 0.5x.
On one occassion when PHD was acting strangely, I clicked on the little "brain" button and saw that a few of the values had changed from their default settings - don't know why!! But restoring the defaults remedied the guiding. Perhaps look there too.
All the best, shame to loose a decent polar alignment though.
Doug
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