Thank you for the information you provided. Please note that 172... is a private IP and it's probably the private IP of your instance.
It seems that there are a lot of warning messages of Pagespeed in the Apache's log so I suggest you disable Pagespeed and check if that solves the issue. Please note that some resources of the theme you use or the plugins you installed in the system may not be compatible with it, in those cases, the solution is to disable Pagespeed.
Happy to help!
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