the most common reason for those units to stop cleaning properly is a stopped up filter and pump assembly, the video I have linked below will show you how to take it apart and clean it out, it's fairly easy to do, and that should fix the issue, if not either you are not getting the proper amount of water into the unit or the circulation pump is not circulating the water properly but 90% of the time if you follow the video you will get it fixed:
video - click here
If you have any questions let me know:
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