Fahim, it's more likely that you need to train your drives if it's not keeping an object in the field of view. If you unlock your Alt axis you'll have to do an alignment from scratch again as the autostar will have lost where it is on the worm gear.
If you go to page 49 of the LX90 Manual, it explains how to train your drives.
I highly recommend reading the Manual from cover to cover and absorbing it.
Another suggestion is to calibrate everytime you use your scope at startup.
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