I have a tool that monitors response time to various internet services from my host, including CloudFlare’s DNS servers. I primarily use this to monitor my connection, but every now and then something like this shows up that suggests the problem is not my problem, but rather the remote service’s problem. This chart shows pings to 126.96.36.199 and 188.8.131.52 for the last week from my host in the Philippines. I also ping other hosts, though they are excluded from the attached chart, and they all have been responding fine for the last week.
The issue started around 2019-02-22T12:28:00Z, and has been persistent every since (as seen by the chart above). Prior to that, both 184.108.40.206 and 220.127.116.11 had similar response times. Since then, 18.104.22.168’s response time is just under 200ms while 22.214.171.124 remains low (~21ms from my host).