Random "Could not capture file" errors

Of late I've been seeing random "Could not capture file" errors in my backups. The files are invariably system-specific files located deep in the folder structure.

Action 2025-03-24 20:01:37 Failure cs_pc_a/evt_journalAttr_38CC956E-31E0-4AAE-A6ED-331771D2BED4_44652778_459.journal

...or...

Action 2025-02-04 10:10:44 Failure speakerRecognition/24D60-915b2b7b58cda908d393076c1774553c56bf6550_15.1033.1-int8_conformer_matrix_split-15.1033.1-en-US.bnnsir

The files that are not captured are not consistent; they seem to cluster around different aspects of the system each time.

This problem just started showing up a couple of weeks ago. Does anyone have any ideas?