I am finding it increasingly difficult to properly close the boot on my 2005 vectra hatchback. Its been back to the garage for `adjustment` but a few days down the line it wont close again. When you close it the latch does not grip the loop and just pulls open easily. It is possible to lock and unlock the latch with a pen when the lid is open, and I have had a fiddle with the screw pads either side of the lid. Any ideas or do I need a new latch? B