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Internet dies when downloading from Steam
(lemmy.world)
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Rare, but it could be a nat table exhaustion. My old 'commander' modem would do the same thing if I opened a bittorrent client.
Try a free or trial VPN like tunnelbear to see if this is the cause. It's probably not, but it's one more thing you can try.
You might be onto something there, doesn't seem to be happening when connected to a VPN