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Qt-15 rapid jumping.

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Machine is a 91 qt15, t32-2 control.

This is nothing I'm doing, and no one else either.

Happens about 4 times a week, damn thing jumps up to 100% rapid without me doing a damn thing. I typically run it at 30, and it just decides to switch it. I've noticed when it does jump it goes to whatever the home rapid is set to, and they just switch places, but sometimes it doesn't switch the home speed also. Any thoughts of what could cause it?

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