Queries:
Is it a processing thing? i.e. if you look at the task manager are the CPU and or HD access spiked?
Is the connection of the mouse to the PC a little loose? (my USB on my laptop started wearing out and my mouse was spastic.)
Is it a laptop with a built in mouse, in addition to the external mouse? Or do you have another external device like a tablet?
Is your desk wood grain? I have a wood lap desk for my laptop, and once the urethane coating wore through the texture of the wood grain was sending my mouse everywhere, or added a "drift" to the cursor, even when I wasn't moving the mouse.
Any new electrical devices in the vicinity that may be causes electronic interference with the mouse?
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"Reality is just a crutch for people who can't cope with drugs."
Robin Williams.
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