ERR_CONNECTION_CLOSED for Viet Nam(internet viettel)

My website is losing some users with viettel internet and maybe some other networks because I haven’t tested it all (in Vietnam).
It happens sometimes (sometimes a few hours and now it still doesn’t work all day), when I reconnect directly to the host (not using cloudflare ) the site runs normally.

2268178 @MoreHelp alo. help me.

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