Just throwing out some ideas -
Have you changed any settings, even if inadvertantly/accidentally with you mouse? Eg, the synch setting or the Centering tolerance?
Do you use eqmod? If so, any chance you have loaded a pointing model from a previous session when you started eqascom?
How about your mount and cabling - anything dragging, catching? Could your mount’s backlash have deteriorated? Are your clutches tight? Any slop or flexure become apparent in your rig? Balance out?
Have you tried updating to the latest beta - any improvement?
Barry