Slow internet connection may cause client (or server) to postback twice

Hi,

Using .Net 4.5.1 and MVC5 on IIS7.5.

I have noticed, that if I connect to a MVC5 application, on a very slow connection, post-backs are sometimes send multiple times (usually twice).

This behavior looks very much the same as if having a breakpoint in a postback method and wait 5 minutes before continuing, then I sometimes experience the same strange double postback.

I do use the Telerik Kendo framework and I can't figure out whether they are to blame or if it is the browser or perhaps server side behavior (as strange as it may sound :-) ).

Any help will be most appreciated.

Thanks.

/Peter