Yea. Just a guess based on "no such host". Can't say without actual details.
DNS errors for sure - It's been two years of trying to work around DNS torture. Reference the thread starting at Troubleshooting DNS issues
I've been limping through the best I can by simply hard restart-ing my modem and router simultaneously about once a week as half of the time the issues improve somewhat - at least for a few days.
I think I also changed the router back to using the Google DNS servers and that helped things at least 50 percent. Correction - it is set to the Cloudflare servers (1.1.1.1 and 1.0.0.1).