Was going to ask if maybe a button was stuck on one of the remotes. Take out batteries and only use app to see if that resolved issue. (which would point to a remote problem). Then narrow down which remote has the issue. By having batteries in a remote having problems, it would just override/conflict with any other remote or app trying to control device.
May not be the problem with yours since repositioning seems to have fixed your issue. Good to hear you got it resolved.
Roku Community Streaming Expert Just another Roku user... I am not a Roku employee. Insignia RokuTV, Ultra 4660x, Premiere+ 3921, Express 4k+ 3941