I have a Whirlpool GU1100XTLQ0 dishwasher. Two months ago the "sanitize" LED light on the front panel began blinking/flashing after the dishwasher completed its normal wash cycle. Utensils and plastic containers are still soiled. Pots and pans have white spots on them. Before that, the sanitized light was lit solid and everything was coming out very clean. I think the blinking light is telling me that there's something wrong. I do use the Cascade detergent pacs that contains a little gel in each pac.

Please help.