At 11:36 UTC on Dec 16, 2020 Linode reported a network connectivity issue in their Singapore datacenter: https://status.linode.com/incidents/bt9z0b25417j
Customer servers and NS in Singapore were affected by this issue and may have been inaccessible at that time. The NS issue may have also affected any domain that uses our Singapore NS.
Service was restored after approximately 2 hours and has been up since that time. (11:36 UTC — Dec 16)