I forgot English is not your first language. You write very well and I assumed you were a native speaker!
I am disturbed to hear that my theory about the freezing temperature was incorrect. I’m afraid that was the only idea that came to mind quickly. I have some more logging tests running, if one of them fails in a similar way I will write about it.
Please let me know how your next experiment goes. This firmware version has behaved very well for me… is it possible someone else connected to your meter and turned logging off?