Replacing the Door Latch Assembly seems to have fixed the problem. The washer would sometimes stop in the middle of a wash cycle and the door would be locked. In that situation, I would have to release the latch manually by removing the bottom panel and locating the manual release tab on the latch assembly. From that point, however, the machine would only respond with three beeps when pressing the start button, and the machine would not start a wash cycle. If you played with it enough, unplugging the washer and then plugging it back in after a minute, it might start working again, but I finally deduced that the door closed switch seemed to be flakey, because if I slammed the door firmly, it would start up. But that still didn't assure that it would finish the cycle. Since installing the new assembly, it has worked reliably.