What verb would mean "to lose calibration" through some (edited to clarify initial intent) intentional action? This would imply an object that previously was calibrated but intentionally changed to a state of uncalibration, e.g., if you deformed the spring in a scale such that it would no longer measure accurately.
"Decalibrate" seems the logical choice but it doesn't appear in Webster's.
Another example: "Don't use a torque wrench to break loose rusty bolts. You might [decalibrate] it."