All correct replies, more often than not this points to a physical layer issue, and I'd also suggest opening a ticket with Meraki Support and this will likely be the first thing they troubleshoot, I'd suggest a support ticket because they can have deeper troubleshooting visibility than would be visible in your Dashboard. Another good suggestion by @JPena was checking the firmware version, go to your Organization > Firmware Upgrades page not only to see what your running, but look through the release notes for your specific AP models and firmware rev (plus previous revs) to see if anything applies. There were some mesh/repeater issues and other general stability/performance improvements specific to mesh/repeater functions over the last year, I think mostly back in the earlier 24.X versions. But even if nothing shows up in the release notes, still worth checking with Support who may have more details than what's in the release notes and change log. Firmware fixes may have more to do with actual mesh/repeater operations, perhaps not what is causing your APs to sporadically fall into repeater mode, which brings us back to checking those L1 issues with cabling, patch panels, and any power injectors first. Ring out those cables with the cable test button (since it's a Meraki switch) but also with an external TDR cable tester if you have one. Also, if not enabled already, you can enable alerts anytime a gateway AP becomes a repeater AP under Network Wide > Alerts.
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