Alexa Won't Resume Sonos

A few days ago, Alexa stopped resuming my Sonos system. I used to be able to say, "Alexa, resume the (Sonos name)," and she would resume that Sonos and all Sonos units grouped with it. Now, nothing happens. I've tried simply saying "Alexa resume," and that works for a short period of time, but if the Sonos has been paused for more than a few minutes, that won't work either. Alexa also no longer tells me what's playing, simply saying, "I don't have information on what's playing on Sonos." The one thing it does still do correctly is pause the music when I say, "Alexa, pause the (Sonos name)," or "Alexa pause." Anyone else having these issues or have a solution?

My configuration: 6 Echo Dots grouped into 4 Alexa groups with 6 Sonos units of various types associated with the different Alexa groups. I group the Sonos units for playback across Alexa groups using the Sonos app.