Error Connection

Hello,

Need Help please….

I’m experiencing the problem with my wordpress and woocommerce. I used Hosting Provider for my website and now sometimes the conncection from my side and server always respond like this:
“This site can’t be reached, http://www.mysite.com unexpectedly closed the connection.ERR_CONNECTION_CLOSED”
This happened upon checkout and sometimea in backend….. I don’t know what to do, maybe this something to do with Cpanel setting like php or ajax etc.

Please help