The issue appears to have been resolved now. Based on our own monitoring, the namservers were temporarily down for maintenance. They are fully operational again, and our own monitoring suggests that they are more performant than before.
Resolved - This incident has been resolved and our nameservers are resolving normally again. (1 Sep - 19:03 UTC)
Identified - The issue has grown: none of our nameservers are responding from any of our monitoring locations. All hosted websites and free subdomains are likely unreachable. (1 Sep - 18:39 UTC)
Investigating - We are investigating issues with the nameserver ns1.infinityfree.com, which is not responding from any of our monitoring locations. Websites should remain reachable through our other nameservers, but lookups may be slower. (1 Sep - 18:32 UTC)