I don't recall any MR52's that I look after, but I have not had that issue with any other MRs. Having said that, I'm not sure I would notice the odd AP rebooting, especially if they only do it one at a time.
Not with MR's - but I have seen Meraki devices in the past (rarely) get into a slow infinte reboot loop because the cloud thinks there software upgrade failed, and keeps repeating it.
The dashboard reports the software version the device is meant to be running, not the software version it actually is running, so only support can diagnose this one.
So perhaps you could ask support to verify the actual code version running on the AP, as opposed to what the dashboard is reporting.