Visual Studio is an extensive IDE which support lot of Addons,Extensions and Third-party services. Due to any issues from addons/extension/IDE, Visual Studio may not start correctly or closes intermittently. In such cases we can run visual studio in Safe Mode.
In order to launch Visual Studio in Safe Mode run below command
devenv.exe /safemode
Fig : Run command
In safe mode, Visual Studio opens with default environment settings, runs limited services and disables running Addons on IDE so that we can disable the item which is causing issue and then run visual studio normally.
Fig: Visual Studio with Safe Mode