Hi Waseem,
Although the link says 2.1.5 after installation version number seems 2.1.6 at extension manager. and still, the problem persists.
So I downloaded 2.1.4 and installed, disable the automatic upgrades from WordPress it seems ok as of now.
If the file you sent me truly 2.1.5 than it means, I have the same problem on 2.1.5 as well.
So I am on hold with workaround, waiting for an update
if you need any assistance I am here, thanks