My TV was down because of room updates when I hooked it back my Roku channel shows fine on HDMI 3 but as soon as I hit any button on my Roku remote the input changes to HDMI 2. Why??
I had a similar problem, I think. When done using Roku I changed TV input to cable. It works but as soon as i touch any put-on on my TV remote the TV input switches to Roku.
I found the answer somewhere in these blogs but cannot find it again. Go to Settings/System/Connect other device(?), click One Touch to OFF. Worked for me.
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Have you tried plugging the Roku feed into HDMI 2?