Custom domain does not work anymore

I made a CNAME entry with my DNS provider that points my custom domain to my page.

That was a while ago and worked fine until now. I don’t have a clue for what went wrong. My DNS provider says everything seems to be OK on their side though.

Is it something that tends to happen from time to time and should reslove by itself? any help is appreciated.

EDIT: the domain doesn’t work without www, but works ok otherwise. I’m now trying to solve it by DNS settings.

I have a question.

What domain provider are you using?

If you’re using google domains I suggest you reading this,

Also, www. doesn’t work because it doesn’t have a DNS set to it.