Machine Does Not Have Enought Water In It
For one of several reasons mentioned, if this is all the more water that the machines gets when it is allowed to run normally it most likely has a bad inlet valve, bad inlet valves in as little as 5-10 years are one of the most common DW problems relating to poor performance. Because almost every DW uses a timed fill approach if the IV is not delivering the proper flow the DW will not work worth a darn.
Of course it could be a blocked fill valve inlet scree, but this is very unlikely unless you have some sort of major problem going on in your homes water supply, to start with most heavy dirt and other particles stay in the bottom of the water heater in hot water systems. But about 95% of the time the FV diaphragm is worn out, on older fill valves you can take the valve apart and replace just the rubber diaphragm if you can find the part separately.