Why Does P6 Crash When Changing Between Layouts Often

I've had this happen in B6 v7.0, v8.3 and R15.1.  P6 frequently crashes if I switch between layouts often after being in a layout for a minute or two.  So if I keep switching between two layouts, like to check data, I will get an error code.  I don't remember the code, unfortunately.  I was wondering if this is a normal response by the software.