I have an older "Solo Sling Box" which for some reason now the virtual remote is almost total dis-functional. Only buttons that do anything is the mute and the volume. I think the only reason I see and hear it is because I leave it on all the time. Any suggestions besides buying a more current model. Did not have this problem before I upgraded to a wireless DVR.
I assume you have already done a proper Forum Search for your model number in case other people have already answered your question ?
If so and that didn't help then check out this thread: https://community.sling.com/message/10363#10363
Come back if it that doesn't help either.