Hi Neil,
The other post: Percona xtradb cluster 8.0.32 nodes are getting crashed
Our lead PXC dev pushed a small patch, PXC-4167: Node crashes with Transport endpoint is not connected by kamil-holubicki · Pull Request #270 · percona/galera · GitHub If you’re brave, feel free to apply the patch and compile PXC yourself to see if it fixes the issue. Our team does not have a reproducible test case, so this patch is a best-effort-on-where-the-problem-could-be.
Otherwise, you’ll have to wait for the next release of PXC which could be as far as 30 days away. If you need something sooner, a support contract can get you a quicker build.