Bad dishwasher pump?

Brian asked 2 years ago
My dishwasher (WDT720PADM1) recently quit washing (water would fill and drain but not spray).  I replaced the pump assembly and it worked great again... for a week.  Then it quit working just like before.  The company I bought the part from is sending me a free replacement but I wanted to make sure there is nothing else wrong before I replace it again.  Is it really possible I got a bad pump that only worked for a week or is something else going on?