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Do you have your drainpipe from the dishwasher hooked up correctly ? you need to have a loop that is higher than the drain itself is that the case ? here is a picture of how your dishwasher drain should be run ,
as you can see in this picture the drain line has to be higher at one point than the connection on the sink. is it ?
My drain pipe runs from the machine at an upwards angle towards the outlet, but does not have a loop on top and then goes down towards the outlet again. Why is this important? I am asking this because it worked fine for quite a while with the current set-up