Thanks for the post.
Have you tried replacing the batteries in your remote to see if you are still experiencing the issue?
Please keep us posted.
Thanks,
Danny
I have this problem too with a system less than a month old.. Roku Ultra SKU # 4800R Remote # RC651 firmware 4134 battery at 38%. Possibly affected by use of volume buttons. Unplugging the heatset doesn't help.... remains locked until power reset . It looks like Roku remotes have had this problem for years? Any suggestions?