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We see this a lot (I own an IT co). Usually it’s routers that do not have enough processing power, a lot of times it’s poor cabling (assuming the ISP is not having the same results upstream of your connection). First, we have to establish the issue is on wired connections. Assume all further suggestions are on wired only connections. Try a new certified Cat6 patch cable from your router to the modem (that would be store bought, not self made/crimped). Did you try the modem directly wired to a computer as suggested by others earlier? If your neighbor is having the same issue its likely the router upstream (ISP) is busy and may delay in icmp (ping) reply. Ping is not an ‘only’ tool. Its just one trouble shooting step, but a good one nonetheless.
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