I have seen multiple instances where ping is not 100% reliable to the Google DNS servers, even with a wired connection and a fiber internet connection. I would suggest you also try to ping against the Cisco Umbrella servers at 208.67.222.222 and 208.67.220.220 and see how they respond. And if you really want to understand what is going on with an internet connection, a Cisco Thousand Eyes subscription will show the performance of every hop between your connection to the internet and any other device connected to the internet.
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