Intermittent connection

[Me.B]

Home connection is not already reliable, don't add up and setup your DNS server on such connection.

Instead use cloudflare or your own registrar DNS and only point it to ip.

If you have bad ping, users will be already slowed down by DNS query then request. That would be a big problem.

Try first moving dns outside.

running centos 7 on dedicated and VPS but in a datacenter and never got such issues that are linked to your connectivity.

M B