In-Place Archiving has Stopped

Hi

We have In-Place Archiving with Retention policies set up for all mailboxes and after working flawlessly for over two years it, but now it has stopped for everyone at a specific date. The best that I can offer is that it appears to have occurred on the same day as my colleague applied CU22 to the servers but I have searched this forum and the internet and can't find any know issues with archiving stopping and/or issues with CU22.

All advice/help/comments appreciated.

Thanks

Tom