Can't find anything that matches this particular issue on Google or here.
Our sink has a garbage disposal that is about 5 years old. For about the last six months or so, the unit tends to propel its contents (water and waste) upward. This sometimes happens immediately when it is turned on, but usually it will happen after a few seconds of grinding.
Is this a common symptom of a damaged/older disposal unit, or is this "normal" behavior?