本地与部署的Laravel问题

I am having a weird problem with my Laravel 5.5 app deployed on IIS.

The App has been running for 6 months with no problem, with people adding data into it.

Since yesterday (No changes on Code Side) when the people try to save a form the app just hangs, no error what so ever, even if I put debug mode On.

Now for the weird(er) part, this doesn't happen on all forms and only happens when using the app "over the internet”, When I Remote into the Server and use the App “locally” then The app works Fine with No Problems.

I suspect its a php.ini problem but cant be sure

Thanks.