To fix DNS server errors on your internet connection, consider taking the following actions:

1. Identify the cause of the error. Some causes may include poor internet connection, DNS server misconfiguration, DNS lookup engine downtime, etc.
2. Restart your modem and router. This will reset the connection and may help resolve the error.
3. Change your DNS server settings to a reliable server. This may help improve response times for DNS query requests.
4. Check for improvements of internet speeds. If your connection is still slow, you may need to investigate other causes.