As no-one has replied I thought I would chime in and let you know there are similar issues being raised in other questions.
There is definitely something going on in the EKF implementation so I guess for now it’s just a matter of us continuing to give the Dev’s our log files and hope they sort it out soon.
I had a quick look at your log but to my untrained eye I could not see anything definitive.
All this new EKF stuff has got me so far out of the loop I am not much use there.