I usually guide my STL11k with internal sensor and SGP API guider.
Very often after the image download, PHD restarts guide, performs dithering and then I got a recovery message from SGP. During the recovery time PHD continues to guide without any problem.
After about one minute or a bit more SGP closes the recovery window and restarts with a new exposure. Without recovery, SGP will end the sequence.
I had this problem with both my setup (G11+FSQ) and (AP1200+ODK) always using STL 11K and internal guide sensor. All is fine if I guide with parallel scope and QHY5L camera.
SGP and API guider are updated, PHD is 2.5.0.
For example please have look at about 21:11 or 21:29 or 21:39.