Its because you clean it alot (and hence specs of dirt/debris/dust) is slowing making its way into the potentionmeter. Really Id advice you clean synths as little as possible.....only when u need to sell them.
Varying resistences in dif knobs is not a problem.....it hapens through use/lack of use.....but the grittyness you eplain is due to debris getting into the Pot. Dont clean you virus for a while and keep twisting the knobs....over time it'll probably smooth out again. Dont worry......theres nothing esp wrong....hell ALL vintage analogs have this.....and no-one butts an eyelid.
DS
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