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I got this issue twice now. It only happened with my own library, playing songs offline. The first time was like a month ago and the way I resolved it was by force-restarting the iPhone and closing the Music app. The second time was yesterday after updating my iPhone to iOS 15.1.1. I force-restarted my iPhone at least three times to no avail. I got like 5 seconds of delay with every song. It was not a bluetooth issue as I tried the speaker. The ONLY fix I found was to plug my iPhone to my MacBook and sync the library. It was immediately fixed. Not sure what was going on, but it was clearly because of the update. It messes up with my library. Hopefully it doesn't happen again. I hope this helps.