As a disclaimer I want to say that I'm very new to guiding and go-to in general as I just upgraded from my tiny skyguider pro.
I've recently purchased a CEM25P, WO 50mm guide scope & ASI120mm-s guide camera in an effort to begin guiding. A few nights ago I had set everything up and was able to get nice round stars at 5 minute exposures guided using my WOZ61. Tonight, after I set up and selected my target I began to run into a an issues in PHD2. After framing my target and doing a test to make sure that M3 stayed in the frame, I began to guide. I noticed that PHD2 acknowledged the existing tracking of the mount for about 1 second but then suddenly dropped off (graph) in both DEC and RA and I began to see both the guide star and target drift out of frame. PHD2 then informed me to check my ST-4 cable for snags because it was unable to make DEC corrections. (I run computer to ASI120, ASI120 to Mount). After unplugging all cables and resetting my computer/mount/cameras I was left with the same problem. What I'm left to assume is that PHD2 is somehow overriding the mount to stop tracking and therefore can't get a good lock on the star? I'm not really sure as to why the mount or PHD2 aren't recognizing each other.
Any help is greatly appreciated!