Extension Host is unresponsive after some minutes of using. 

- Extension Name: python
- Extension Version: 2018.9.0
- OS Version: Windows_NT x64 10.0.17134
- VSCode version: 1.28.0

 ```json 
{
	"activationTimes": {
		"startup": false,
		"codeLoadingTime": 1725,
		"activateCallTime": 177,
		"activateResolvedTime": 514,
		"activationEvent": "onLanguage:python"
	}
}
```