Disk Utility/First Aid in Safe Mode shows error not shown when running in Recovery mode
I've had some problems with my computer restarting overnight. Etrecheck (see below) seemed to show some minor issues. I’ve run Disk Utility first aid in safe mode and all is ok until I get to running it on my Apple SSD. I am told "Problems were found with the partition map which might prevent booting" and "Couldn't mount disk :(-69842)". But I do not get this message when I do it normally or in recovery mode.... understandibly I'm worried! I've tried it several times. Running DriveDX doesn't say there are any problems.
Any ideas much appreciated.
MacBook Pro 16″, macOS 12.3