There have been many reports of people in the last week who have had their nameservers changed to ns1/2.epizy.com.namesilo.com. Those nameserver addresses are too specific for this to be a configuration issue on your end.
Normally, we’re not supposed to have any control over you domain whatsoever. The only parties who should make changes to your domain are you and your domain registrar. Hosting providers should not be able to make any changes to your domain settings at your domain registrar.
My guess would be that it’s related to the DNS issue with epizy.com of earlier this week. The symptoms of that issue make me suspect it was an issue at the registrar or registry who messed up the NS records and glue records of the epizy.com domain.
So I think (and this is purely speculation) that NameSilo or, more likely, VeriSign messed up the epizy.com domain nameservers and glue records, and in doing (or undoing) so, also edited the nameservers for any domain using the epizy.com nameservers.
But this is just a guess. It was a massive struggle to get NameSilo to actually acknowledge the issue and do something about it, and I’m still struggling to get some explanation as to what happened with epizy.com.