If your Magic Mouse is not scrolling only when your Mac is under heavy load (e.g., transferring files or connected to a crowded Wi-Fi network), interference is the culprit.
Before you throw your sleek white mouse against the wall or rush to buy a replacement, take a deep breath. This is an incredibly common issue, and in 99% of cases, it can be fixed in under five minutes without any tools. magic mouse not scrolling
Visit an Apple Store. Genius Bar technicians have a diagnostic tool that forces a firmware reinstall on the Magic Mouse—a fix you cannot do at home. But given the steps above, you likely won't need it. If your Magic Mouse is not scrolling only