A number of players have reported that using VPN resolves the connection issues. This is indicative of (changed) QoS settings at your ISP that negatively impact the direct connectivity to Tranquility or BGP routing issues or cross-connect/peering issues, since a VPN connection will send the network traffic through a different route or to a different Cloudflare datacenter.
If you have successfully resolved the connection issues using VPN, then we would want a traceroute both with and without the VPN active, to be able to see the different network paths.