There's nothing in those logs that is indicative of the problem. The next time this happens please open the browser console and copy / paste the entries that start with AUS:
Bug 1592731 Comment 6 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
There's nothing in those logs that is indicative of the problem. The next time this happens please open the browser console and copy / paste the entries that start with AUS: and any errors that might be applicable