Hi Scuders
Try unplugging your box and leaving for a few minutes or over night,
sometimes this will clear any bugs.
Next if this don’t work do a factory reset.
Another thing to look for is low batteries in the remote as they do not last long, always change them first to rule out the remote.
You don’t need to pull off the buttons on your remote, all you need do was to take the batteries out or take it in to another room to see if the banner went off.
I think you may need a new remote now.