I share your frustration. I purchased DW80R9950UG about 6 months ago and dishes on the bottom rack would not clean properly. We purchased through Costco so went thru them for service and they sent out a Samsung repair person. It turned out the linear wash arm on the bottom of the dishwasher became disconnected from the rail. He repaired it and the bottom rack dishes began getting clean again. About one week ago, the same issue happened. I researched on YouTube and some DIY people are saying it's a magnet on the linear wash arm that isn't strong enough to keep it attached to the rail. We called Costco again who called Samsung. The samsung rep says that this part isn't under warranty. Very frustrating!!! 6 months and a critical part fails. I am worried that this part is going to fail frequently given what I've seen from customer reviews. We are also going to try to find a place to purchase a replacement part since the only other option is to purchase a new dishwasher. Terrible quality in this product.
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