Background

We have a google app engine app serving a custom domain (https). The setup 
has been working for over 2 years now (initially it was http and we shifted 
to https around 6 months ago). Past one month we are facing intermittent 
issues of pages timing out/long delays (over 20-30 seconds to load instead 
of usual 1-2 seconds). When we access our app directly via the appspot url, 
it works consistently.

Debugging the issue we realized the following:

When I ping our appspot link (https://appid.appspot.com), the IP address is 
*74.125.130.141* and it ping consistently

   - When I ping our custom URL (https://www.appdomain.com), the IP address 
   is *74.125.200.121*and ping fails intermittently
   - When ever the IP address is pingable, our app works fine. When ever 
   the app is timing out, the ping also fails.
   - The failing IP address seems to be one of the IPs in google IP address 
   range - see output of https://ipdb.at/ip/74.125.200.121
   - The CNAME record for my domain for the host "www" points to 
   ghs.googlehosted.com

Questions
   
   - Has anything changed within google app engine IP mapping in the recent 
   months?
   - Is there a way I can force my custom domain to reach a "stable" IP 
   address within the google app engine farm?

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