I like the Your Phone app on Win10 but it will break now and then and needs reinstall. The symptom I've had is mouse clicks on messages or people will not register.
Open Admin PowerShell and paste this
Get-AppxPackage *Microsoft.YourPhone* -AllUsers | Remove-AppxPackage
Or use CCleaner's uninstall
Go to store and install again.
It will need to be set up again and removed from phone but this has worked twice for me.