[Macwash]

My Frigidaire dishwasher is about a year and a half old, bought new at Lowe's and is having issues. We always use the "Quick Wash" setting for our dishes since it takes less time and water and cleans great. The day before yesterday, I turned on the dishwasher like normal but when I came back after the allotted time (50 min cycle) to put away the dishes, I saw that the dw had switched itself over to another cycle, the "Normal Wash" or "Heavy Wash" cycle (the times are the same on both so I wasn't sure which cycle it had gone to) and was busily still washing away. Today I sat with the dw to see exactly what it was doing. I set it on "Quick Wash" again, closed the door and the cycle started. Everything was fine until after the tub filled with water and the actual washing began. That was when the dw switched itself over again to the other cycle. I've gone through all the other cycles seperately and this is only happening with the "Quick Wash" setting. Can anyone shed some light on this for me? Thanks!