I moved the site off my Windows VPS on to a Linux VPS to get around those nasty monthly Windows Update reboots.
As a consequence, the site has a new IP now.
The DNS entries for qlstats.net were updated, but it takes some time until all caches fetch these updates.
In the meantime you can use the name w3.qlstats.net, which brings you to the new site too.

This may also affect your minqlx / balance.py installations if your server still gets the old IP address.
I restarted the old database on the old machine, to return you the old ratings instead of an error.
You can force minqlx to use the new server by appending +set qlx_balanceUrl "w3.qlstats.net" to your serversettings.
This is not necessary when your server already gets the new IP address or you are fine with the old ratings for the time being.