There is a little ball bearing in the quick release mechanism and it's probably getting jammed. I was sure the br-5800 QR was the same as the 6800 and could be disassembled but that looks riveted together.
Yeah, doesn't look like there's a fix unfortunately. There's just a rivet under the cap. Annoying. T hanks anyway.
@Goyt started
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There is a little ball bearing in the quick release mechanism and it's probably getting jammed. I was sure the br-5800 QR was the same as the 6800 and could be disassembled but that looks riveted together.