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Hyperdude posted on r/wow2w
I was also having issue with random internet lag spikes. The way I solved this issue was buying my own router. TP-Link AX1800 WiFi 6 Router... https://www.amazon.com/dp/B08H8ZLKKK?ref=ppx_pop_mob_ap_share This is the one I use. It been amazing because you can set your pc for high priority for internet use. This was my way to solve my problem. Hope it works for you.