I’d do this first.
Sounds like you have a buffer spring issue...time to disassemble and clean or replace the buffer spring with a new one...when installing the new spring, I recommend lubing/spraying with white lithium grease for long lasting protection from corrosion.
When I had my SBE, I did this and was surprised at the amount of built up "crud" had found its way into the recoil tube of the stock!
Yup, I’d start with disassembling the recoil tube, throughly clean everything in it and the reassembling. If that doesn’t work then replace the spring. (Because they’re cheap, I’d replace the spring while it’s disassembled) https://fb.watch/5gYMYGlJys/
I was having a failure to feed issue with my M1. After replacing the extractor, ejector, follower, ALL springs and recoil tube, it ended up being the lifter. Sometimes it can be a pain chasing down an issue but most likely it needs a really good cleaning.