If you are getting a lot of freezes, make sure your hardware is suitable to play Renegade-X, and check if you have the latest graphics drivers installed. If that doesn't help, your system may be overheating (do you play any other games where you get freezes?).
My guess would be that the freezes cause the false positive message. For example, if you are walking at a speed of 1 meter per second, and the game freezes for 5 seconds, then when the game continues, it will cause your character to "jump" 5 meters to catch up for the 5 seconds that it froze (in which your character couldn't move). This jump is then detected and the message appears. You can probably ignore the message; the issue is caused by something else.