Hi. I have also been having same problem with ekos crashing after 3rd image in polar alignment. I did start my own thread before I saw this one. 
also after having a quick look at your log file there is an error that is same as in my log file.MouseArea: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
[2021-09-27T22:21:14.531 BST WARN ][ default] - qrc:/qml/mount/mountbox.qml:428: ReferenceError: xi18n is not defined.

it may be nothing an sure means nothing to me but after the 3 Rd or 4th crash I narrowed the time in the log to the time it crashed.
also I tried lowering the slew speed which still crashed after 3rd image
. Let's hope we get this fixed.
thank you

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