Everything seems to be related to .ng
because we have another case here
I don’t think it has anything to do with hosting
it could be something related to your country or related to the com.ng TLD
and nic.net.ng NS
In the sense that these parent/root nameservers (of your domains)
they have or had a problem so they are not returning the right data, so you experienced it as the impossibility of accessing your website.
or is related to your ISP (MTN N… Communication limited)