Positioning Failed

Twice today the robot has gotten "Positioning Failed".  It's noon, bright and sunny.  The lenses are all clean, and the robot is in the middle of the yard.  It's walked back to the station with the work 60% done.  How can I figure out the real cause, and what causes this problem?

I think there are some major bugs in their software, mine moves the station about 30’ east every time it mows and I have to remap. Restore does not fix.

Good morning, sorry for the inconvenience caused. Please provide the exact time when the fault occurred, photos or videos of the error, upload your machine logs, and share your machine SN, exact model and firmware version. We will forward these details to our technical team for further root‑cause analysis. We hope your issue can be resolved as soon as possible and look forward to your reply.

Do you have the latest firmware? App version? Remap?

Here is a list of failures, and a screenshot of where it was for one of them. I'm running 4.3.6_0452 with plugin 3.3.3 .
Only one pic per day, so this is the list.