Crash of datafield without a log file

I have a user that experiences crashes with his Fenix 5x for my Datarun premium datafield, but doesn't get a log file that has CIQ*.*. He did send me a compressed version of the file system on his watch and indeed there is no log file. There are no other users reporting crashes at the moment, but that does not say everything; someone has to be the first to do.
What does it mean when there's no log file, is the operating system of the watch itself crashing?
Can someone do something else (check some other log file or factory reset)?