Huh, that’s odd. I don’t have that exact model of Vizio, nor, frankly, do I use the Vizio remotes. Nor am I a Spectrum user, being kind of stuck on DirecTV.

I am, however, wondering if there’s any possibility that the remotes are being ‘reset’ in some fashion by firmware updates to the cable box. I have had one instance in the past where an update changed the output of my TV’s optical connection, but since I only use Harmony/Logitech remotes, I have no experience there to fall back on. 

That being said, I’ve never, in the last 11 years, had to reset up the Sonos to read the IR from the Harmony remotes, which makes me wonder if it’s ‘upstream’ from that. Unfortunately, I just don’t know. 

The one thing I’d recommend is definitely changing out the batteries on the remote. Sometimes the IR sensor on the Sonos can be overwhelmed by outside light (particularly from Plasma TVs), so it’s worth double checking that the sensor is clear and unobstructed as well.