MannyS So what is the solution since I do have an equatorial mount?
Did you check post #2 of this thread? That post addressed equatorial mounts. You did not post any response to that post, and instead posted something about alt-az mounts.
If it is not a meridian limit stopping tracking, and all clutches are properly tightened, and you have checked the third axis balance, make sure none of your cables is preventing the mount from freely moving. If you have a good mount with enough torque, cable weights are less of a problem (I use a harmonic drive mount).
You also did not mention if it is the RA axis that took off, or the declination axis. That would certainly help the rest of us provide help for you. None of us work for ZWO, and the more information you provide, the more likely people will help you.
If you had followed the YouTube video on third axis imbalance, you will also see that the original poster had also answered a question by saying
" It isn't an issue if you are deliberately balancing one orientation heavy, such as when you have very bad declination backlash so are trying to account for it and are guiding in one direction only in the dec axis. However, if you have a mount with little or no backlash you ideally want the balance as good as you can get it, so this does play an important part, especially if imaging near the zenith. "
(Bolding emphasis is done by me.)
EDIT: mount balance is more important as you get closer to the payload capacity (i.e., when you approach half the manufacturer's specs for payload, if you are doing instrumentation). The exception is harmonic drive mounts (Askar is about to release one too), which have plenty of torque. The balance is like the way garage doors work -- the small garage door opener motor has very little torque, and would not be able to move the door if not for the counterbalancing springs. The same is true for most legacy mounts; the motors and gears would not be able to move any kind of payload unless the mount is well balance throughout the night. 3rd axis imbalance causes the center of gravity to shift with the hour angle. The problem comes when there is imbalance when you look down the declination axis. You see people all the time with small mounts using an EAF and not counterbalancing the weight of the EAF -- that is a recipe for poor guiding.