Mouse roll suddenly became very inaccurate! help!

I've had this mouse for a few months. very much satisfied. 'till the mouse wheel suddenly became very inaccurate, i mean if I roll it down 3times it scrolls 4times down 6times up. now i really really would love to keep this coz i'm soo used to it. plus i'm sure the problem is hardware, coz software doesn't just decide to stop working!! definitely hardware problem.

now my question is: if I open it up, what next?

i mean how do you fix a mouse roll?? it's not like they got spare parts!

how do i detect the problem?

very much appreciated

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