Furniture and Furnishings - file drawer problem

I have file drawers that won't stay closed. When I close them they slowly open to about five inches and stay. Is there a way to tighten them? Or adjust them so they will stay closed?
Thanks

sonnyvan, Welcome to the DIY Forums.
This may seem silly but, is the file cabinet on a level surface? You may have to put a couple shims under the front edge to get it level or tipped back a bit. Good luck.

Thanks for your comment. Actually, I've put shims under the cabinet already.
The floor is level. Any other ideas? Please?

You could also try rearranging the files. Place the heavier file folders at the back of the rack and the lighter smaller folders at the front. If this is not possible you can use a weight of some sort in the back of the drawer. You may also be able to close the tracks slightly further than present. This would make them tighter and less likely to open of their own accord. Use a pair of pliers and carefully adjust the runners that the rollers roll on. you can even place a piece of tape on the runners to make them less slippery.
Good luck

I agree that glide system for drawers needs to be inspected and adjusted. The only way to know if the file cabinet is level is to place a level on top of it. Perhaps more shims are needed. And, as indicated, weighting back of drawer may help with keeping drawer closed.