If you are using Root Hints in your organisation for DNS lookups, you should probably check your root server IPs to ensure they are up to date… especially if your DNS servers/DCs are quite old.
The root server FQDNs and IPs are baked in to the DNS manager in Windows and although they don’t change very often (for obvious reasons) it is worth checking that the IPs are up to date; when I checked on my servers there was one entry that needed updating… not likely to cause big problems but definitely worth checking.