My remote for my roku express has partially stopped working, the only buttons that work are the home and up arrow. It is not a battery issue as I have changed them 3 times and it is not a blocked signal issue as there is nothing between the device and remote. I used my camera to check the IR ans it only shows up when using the home key and the up arrow.
I am currently unable to use my device as I just got new internet and cant set it up to use the app as the remote wont work
Its faulty remote, you need to replace it but it doesn't have to be a roku remote, since the express uses a IR remote any cheap universal remote with roku listed will work just fine. And the benefit it will control your tv as well.
Please send me a PM with your Roku account email address, and include the serial number on the Roku device along with a summary of the issue you are experiencing. I'll be able to assist you further from there.