I've fixed the Linode DNS issue by using another DNS provider... take that Linode
I've also upgraded aus.social to the recently (5 hours ago) updated version of Mastodon... So we're now on v3.5.3 that includes a bunch of security and performance fixes!
https://github.com/mastodon/mastodon/releases/tag/v3.5.3
Have a nice day, everything else should be back to normal 
@aussocialadmin I have a feeling this is probably that: https://health.aws.amazon.com/health/status
"We confirm intermediate DNS resolution issues for certain specific AWS names. This is due to an issue with a third-party DNS provider outside of AWS. The third-party DNS provider is working toward resolution. We are also working toward a resolution that addresses the issues the third-party provider has encountered. Queries for DNS records hosted on Route 53 are not affected by this issue."
