Hello @nmurray83, welcome to Sonos Community!
How exactly are you listening to Radio stations in the Sonos App? If you have a Radio station in your Sonos Favorites, I would suggest removing it from there, look it up via Sonos search and re-add to favorites. Sometimes radio stations change their URL. By occasionally refreshing your favorite Radio stations, you can ensure to always have the correct link.
Re-installing the Sonos app wouldn’t change this behavior, I would suggest re-authorizing YouTube Music, that could help. Also make sure your Sonos controller (smartphone/tablet) is up to date, along with the Sonos app and your Sonos speakers.
A network refresh always helps, starting with a reboot of your Router → Sonos speakers → Sonos controllers.
I understand that it can be difficult contacting our Sonos Support via phone during working hours, you could give our chat a try. Don’t forget to Submit Diagnostics within 10 minutes of experiencing those issues and note the number down.
Feel free to reply here with the diagnostics number as well or with any further question you might have.
I hope this helps.