The scanner's lid pulls upward a bit, and can sometimes get stuck that way -- in that case, the hinges won't bend. Try making sure the lid at the hinge end is flush against the bottom part of the scanner.
Hi,It could be that you are running out of memory. Try using a lower
quality scan setting to determine if that is the issue. (If more of the
document is scanned then Memory is likely your problem.) If not try
reloading the software.