I'm a novice at reading those logs but it looks like it went atti and out of atti in less then a second. Says week GPS yet it's reporting 27 satellites...
Here's the relevant section of the data:
It's a bit confused/confusing.
You you were out in the open with 27 sats and the number of sats didn't change.
But the GPS Level dropped to zero.
If GPS Level = zero, the next column Is GPS Used should show False, but it only does for half the time GPS Level =zero.
And the Flight Mode only showed as Atti for part of the time that GPS Level was zero.
I'd tend to write this off as a harmless glitch in the data.
It makes no sense and there's no indication what might have caused it.
Keep any eye out for any recurrences.
If you start seeing this repeating, it might be an issue.
If you don't see it again, it was nothing.
Mentions compass too. Perhaps a compass calibration is in order.
There's nothing wrong with the compass, the message is poorly worded..
Recalibrating the compass is not necessary and won't make any difference.