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Hi G,
More than likely it's something like dirt, dust, grit in the grease/oil if there are any exposed bearing surfaces/drive elements. You may be able to test that somewhat if it is possible to decouple the drive drive form the telescope via a clutch/es and then see if there is still any friction or stiffness in the motion when the dob tube is moved by hand. That may help point you towards whether it is a bearing or drive issue.
If you are unlucky and the scope has had a knock during its period of non-use then some sort of drive/bearing misalignment may have occurred. Try the test above if possible to help point you in the right direction. Without knowing your scope it is not possible to say for certain whether you can indeed decouple the drive to test.
Good luck in your investigation, hopefully it's something simple to rectify.
Best
JA
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