This isn’t an exhaustive list, but my top fixes.
Locate the devenv.exe for the version of VS that you are working on.
- devenv.exe /SafeMode
- Suspends plugins
- devenv.exe /ResetSkipPkgs
- Removes packages that are having problems
- devenv.exe /ResetUserData
- Resets all of the user custom settings
- devenv.exe /ResetSettings
- Resets VS to default settings, no plugins.
Brian By Experience 