Ionic latest version not auto compiling the app

Android SDK Tools : 26.0.2
Node : v6.10.2
npm : 3.10.10
OS : Windows 10

When i make code changes Browser Sync is not picking up the latest changes anymore

i have to stop the server and do ionic serve again to recompile and get the new build to run

this started happening recently.

do you know how can i fix this?