Very slow internet this morning

Hello, since this morning I cannot download faster than ~250 to ~300 mbps rather than the usual 1gbps I get.

I benched my network / router with iperf3 and I do hit 1gbps so my network is fine. I rebooted the Helix Gateway but to no avail.

I use fast.com, speedtest.net and the videotron ookla test my connection which all give me the same result.

Anyone experiencing the same?