Side scrollwheel no longer working after disassembly

Side scrollwheel no longer working after disassembly I took my MX Master 2S apart from cleaning and everything went well.
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Guest [Entry]

"Logixal

@logixal

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Guest [Entry]

Had exactly the same issue here (optical sensor stopped working out of nowhere). It turned out that the "thumb button" was screwed in a little to tight and started triggering the "gesture" command through the software the whole time, deactivating the optical sensor. I disassembled the mouse and untightened a bit the "thumb button". Problem solved. :)