I can sign into Vanguard’s 401k website, but navigating around will log me out with the message “You have been logged out”. If I connect to a Verizon hotspot form an iPad, I have zero problems. It’s easily reproducible, just sign in, and navigate to activity history, select a report, or update savings rate and you’ll be logged out. Not new, this has been happening ever since getting T-Mobile Internet, but I was just able to verify it always fails with T-Mobile Internet and never fails on a Verizon connection.
I’m using a home mesh network with an Ethernet connection to the T-Mobile Internet modem (I don’t use the T-Mobile Internet WiFi at all for coverage reasons).