decided to google for 137.221.76.33, found many other players from brazil or elsewhere in south america having the same issue at this same hop.
in this last post, a brazilian GM replied and confirmed the issue at this very same hop, although this was back in 2019 so unsure if this could be related at all, but you can clearly see from this GM that the issue was in fact on their end because, as i’ve said before, they own and operate this hop.
more recent cases are in here and the last reply is from almost 2 months ago saying they were collecting information.
since this is probably happening to people connecting from south america (if the PTR record for this router is to be believed, it receives connections from brazil and likely south america in general), then i think i’ll have better luck raising the issue in the brazilian forums as tons of other people like me are experiencing this.