Gzip compression issue on iis 8.5

Question

The problem is as soon as i recycle the app pool Gzip starts working but after 2-3 minutes it again stops working ,testing with google chrome (in response header not getting Gzip) or any tool says Gzip is not enabled.

But when i again recycle the app pool ,it starts working.

 

what might be the issue. Please if anybody have faced it then any help would be appreciated.

 

This is my web.config

<httpCompression directory="%SystemDrive%\websites\_compressed" minFileSizeForComp="1024">
     <scheme dll="%Windir%\system32\inetsrv\gzip.dll" name="gzip"/>
     <dynamicTypes>
       <add enabled="true" mimeType="text/*" />
       <add enabled="true" mimeType="message/*" />
       <add enabled="true" mimeType="application/javascript" />
       <add enabled="true" mimeType="application/json" />
       <add enabled="true" mimeType="application/json; charset=utf-8" />
       <add enabled="false" mimeType="*/*" />
     </dynamicTypes>
     <staticTypes>
       <add enabled="true" mimeType="text/*"/>
       <add enabled="true" mimeType="message/*"/>
       <add enabled="true" mimeType="application/javascript"/>
       <add enabled="true" mimeType="application/json"/>
       <add enabled="true" mimeType="application/json; charset=utf-8" />
       <add enabled="false" mimeType="*/*"/>
     </staticTypes>
</httpCompression>