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Hi, thanks for getting in touch. I know exactly what you're talking about as I myself got an Occulus Quest 2 a few months back. It's because your lats (latisimus dorsi) muscle is getting a workout through VR and is actually really common. On the other hand with time the muscle will actually get stronger. I'd advise you take an ibuprofen with food and leave the VR for 24 hours and you should notice it's better.
Absolutely, sometimes it's not a repetitive motion that's the cause of the discomfort but can just be the angle at which we move etc. It's actually not a bad idea to do some stretching before playing. It'll definitely get better on it's own just give it a rest for 24 hours and stretch out before you next play.
You're very welcome, glad I could help. If you could leave a positive review I'd be really grateful. All the very best :)