Yes, I have the exact same issue with my newest Ultra device purchased in Dec 2019. Over the past 2 months, there has been an annoying lag whenever I scroll up/down the channel menu or when I try to call up the menu, or when I try to change the channel. I have just sent a note to Roku support to see what they say. This is my second (and newest) device. I do not have this issue with my original Ultra device in the other room which is now over a year old.
The problem ended up being the remote. I tried using a remote from an older Roku device I had and now it works fine.
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That's what I'm going to try this morning, since I have 2 Roku ultra devices. Roku support team asked me to contact my internet service provider and have them set the "channels" to a certain number to mitigate any signal interference. I did so yesterday and it did not solve my problem. I will report this back to them. I will try using the older remote this morning to see if that solves the 3-4 second time lag that occurs when I try to change a channel or scroll through the menu. Thank you for your reply.
