Alienware M15X bluetooth mouse issue

Hi,

I have 2 different bluetooth mice I can use with the native Bluetooth card in the Alienware notebook.  

They both work fine until I am downloading or uploading large files via WiFi.  Once I start a large download, the mice become very slow and choppy.  I have the latest drivers, etc.  But it is baffling.

One of the mice is a Microsoft BT Notebook mouse 5000 and the other is a Dell branded bt mouse ( it's at work so I don't have the mdl number)

Any ideas?

Thanks!