I think it has something to do with Chrome, I haven't tested the laptop yet but it comes and goes on the Samsung tablet using Chrome but I also have Firefox on tablet and tried that and it is working.

There is a message under the the New Improved DNA message in Ancestry, Lab on Extras about Chrome it may have always been there but I never noticed it and it has always worked on Samsung tablet Chrome up until yesterday.

oh for gods sake I am now getting this message on the Laptop Microsoft Edge and FireFox when I try to access Ancestry Labs

"502 Bad Gateway

The server, while acting as a gateway or proxy, received an invalid response from the upstream server it accessed in attempting to fulfill the request.
Click here to go back to Ancestry home page"

The rest seem to be working okay.