Today, Microsoft released a patch for Visual Studio 2015 Update 3, which was released on 27th June 2016. It is a cumulative update with fixes to the existing Microsoft Visual Studio 2015 Update 3 installation. If you have installed Update 3, install the patch KB3165756 mentioned below.
Though it is not mandatory, but good to have install this patch as it addresses many fixes related to memory leaks, crash and other issues.