I work a Belgian hosting provider, directly uplinked to our datacenter via Cogent/TINET. The same happened here. There's no hardware cause, it appears to be a

I work a Belgian hosting provider, directly uplinked to our datacenter via Cogent/TINET. The same happened here. There's no hardware cause, it appears to be a minor chrome update combined with a QUIC server-side update (unconfirmed) that caused issues. As soon as Chrome auto-updates to the next minor release, things appear better (but not fully fixed). It's entirely in the browser <-> Google server-side, ISPs have nothing to do with this.