[tStano]

A definition of "Extremely Quickly" is needed. 'Gyro Drift' is a real thing. Its part of the physics of gyros that they slowly get off (roughly a degree every second or three). This is (simply put) because you are taking a discrete integral of a noisy signal. You can compensate by resetting your gyro when you're at a known angle, or with some really fancy code, but slowly counting up is a thing gyros do.

If you are seeing huge jumps, then you may have real problems.