Mount slews during exposure

I’m new to SGP so here goes . I frame my target setup sequence all goes well mount slews to target
plate solves PHD2 kicks in and does its recalibration. I was doing 300-second exposures after about
200 seconds the mount would start slewing off target. Is there some setting I’m missing.
Mount HEq5 .
Thanks

what do the logs say ? I would only expect SGP to start slewing the mount, if PHD2 has lost the target, so would then finish\stop the image being taken & initiate a re-centre…

I solved the problem. It was the wrong setting in ASCOM pulse guide in EQ mod.
Thanks for your reply

Frank - welcome to the madhouse! We have all done ‘doh’ things. This is the place to share those special moments… like the time I thought my new telescope had terrible collimation only to realize, days later, I had focused on Saturn…