I have had the blurry channels on my roku ultra for a couple weeks. It only seemed to effect the xfinity app. I had previuosly tried rebooting the cable modem, the roku ultra, with ethernet cable, with wireless, etc. I noticed that system update on the roku ultra said it was checked today (10-25-2020) but the last update was listed as August 8th. When I went into system update manually it updated by multiple versions. Now the xfinity app works nice and clear again. The roku ultra is now on version 9.4.0 Build 4176. So it appears the roku ultra was not updating automatically for a couple of months. Hope this helps some.
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