You are probably having network issues. Try deleting and reinstalling the Sonos app on your phone and unplugging your speakers from power for a couple of minutes and rebooting your router. If this doesn’t work, try wiring one of your Sonos speakers (not a Sub or surround speaker) directly to your router with an ethernet cable.

Running iPhone 15 Pro doesn’t show correct song running through speakers. It remains stuck on a song played an hour ago. Tried pause and start, and that didn’t help.