Running like over a 100 miles an hour, It has sped up and I don't know

The sander is on overdrive it has sped up and will not quit it won't even hold a pad on it because it's going so fast.

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@sweetietea65 what make and model is it. I wonder if this is a transmission error so let's if we can fix this....

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I have the same problem, but I have not found a solution yet. My Ryobi orbital is stuck in high gear and won't slow down. There has to be a reason.

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