Thanks for that. Model 3400 is the original Roku MHL Stick. Is there a Stick that plugs into the back of the TV in an HDMI jack? You would still control it with the TV remote. If that's what you have, it's really old hardware and may just be worn out. I have an old 2 XS which is pretty much the same internals as the 3400, and it's so bad I never use it anymore and have replaced it with newer equipment. . If there's no Stick plugged into an HDMI port, then I don't know what you have, and someone else will have to chime in here.
Dan Nvidia Shield, Roku Stick (3600), Ultra (4640), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.