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Your ISP is likely not the issue if you're able to get consistent 300 Mbps throughput rates against the nearest server via speedtest.
First of all, you need to do ALL the network diagnostics via wired ethernet as a process of elimination. This sounds like an RFI/EMI related issue, or possibly even RF channel saturation against neighboring APs.
I can offer you free professional help via phone and TeamViewer if you can beat me in a 3-minute blitz game. PM me if you're up for it.
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