I had the same problem and this is how I fixed it:
First close BF4 if it's still running. After that edit your BF4 configuration profile file (C:\Users\USERNAME\Documents\Battlefield 4\settings\PROFSAVE_profile) with notepad or another editor.
Search for the text "ConceptZoom.3.button 14" (using ctrl+F) and replace it with "ConceptZoom.3.button 255" . You will find this text in 3 locations within this file; so replace all 3 occurrences. When done, save the file. Now you have unbinded the freelook key, so the issue is gone.
I hope this helps fixing your issue!