Oversudsing occurs when to much detergent is used, or the wrong type of detergent is used. This issue can cause leaks, drain issues, and leave residue on your dishes. If this happens you can neutralize the suds by applying several table spoons of non-dairy coffee-mate or by pouring olive-oil on the suds. Shut the dishwasher door, and continue cycle. This will help break down the suds, and allow the unit to drain.