I'm not sure what caused these, but whenever I end a flight, my screen turns black until that portion is reloaded (for instance, if I mouse over an icon, the area reloads. If I open a program, the whole area that the program occupies reloads), and a warning sound plays (like "Too low, flaps" or
"Don't sink") even though I'm not flying. Does anybody know a fix for this? 

Thanks,
boeing247