Thanks for posting.
This is strange, when did this start happening? Let's try resetting the speaker and see if it goes. Please unplug the system for 5 minutes and then plug it back in and let me know what happens.
Thanks for reaching out.
All available remote codes for the Solo 5 can be found here. If your TV code is not listed, the great news is your system can be controlled by a universal remote providing it uses an infrared signal.
Let me know how you get on!