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Eden, not to diminish in anyway your good advice to Jakob, I need to comment on your advice ..... "You might wish to increase the delay between guiding camera exposure times so that your mount is making fewer corrections. Depending on the brightness of your guide star, 3-4 seconds is a good value."
This may work for cameras such as the SSAG or SBIG ST-1 but this will not work for the ZWO ASI cameras, or potentially any other video streaming type camera.
For those of us using a camera like the ZWO ASI130MM or ASI 120, these are sending a continuous video stream over the USB link to the computer at a much higher rate than any of the control exposure type cameras. For people using the ASI cameras you have to set the PHD rate to between 0.5 and 0.05 seconds in order for the frame rate of the ASI camera to sync with the rate at which PHD can handle the frames. Using a slower rate, such as anything one second or longer causes the image frame rate to become out of sync and PHD will start generating false Lost Star errors, and if PHD gets too far out of Sync with the camera PHD will appear to freeze. (this is all from a post on Cloudy Nights by fmhill). I have found this is the only way I can get PHD2 to work (consistently) with my ASI camera.
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