Rebooting them both will only help for a period of time, then the problem will resurface again eventually. Waking the watch doesn't work for me, I have to manually advance it.
Iphone 15 Pro - 18.2.1
Watch Series 9 - 11.2
In addition. this is purely a watch problem because it only happens for me when I'm streaming from the watch directly and I've left the phone at home. Rebooting is NOT the answer because like most folks you're probably exercising or on a run and rebooting the watch is not an option.
Please fix this Pandora!
Moderator Edit: Merged comments
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