Multiple CRM windows keep opening, seemingly on their own

Multiple CRM windows keep opening, seemingly on their own

I have the Business set up and added the CRM app (left side of choices) however once the CRM is open and I am working in there it keeps popping open additional (identical) CRM windows. 
 
I would appreciate any thoughts on how to make this stop.
 
-Tks-
 
-- Ginger