When I am working in excel I am usually using more than 1 sheet and I am constantly pressing ALT + TAB to switch quickly between spreadsheets or other applications in windows. Now that I have 2016 I am having major issues and it is driving me bonkers ........... if I have the Find and Replace box open the ALT + Tab will usually treat the Find and Replace as a separate window and it will switch back and forth from the excel sheet to the Find box .............. in other works pretty much does nothing. the only way to bypass this is to press ALT+Tab twice.

Is there a way to fix this, please?