The problem ended up being the remote. I tried using a remote from an older Roku device I had and now it works fine.
Additional resources that you might find helpful:
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.
