Josh, I'm not sure if this is the case for your bag, but mine has a plastic piece on the leg stabilizers that can be adjusted to hold the legs up tighter so they won't fall.  Like I said, I don't know if it will work on your bag but it did for mine.  Hopefully it does!

I second Christian's recommendation. I've had that happen with an off brand bag, and this is how I fixed it.

I currently have the 9.5 Top Staff bag. When some of the rubber pull tabs on the zipper began to break apart (sun and rain will do that) I wanted to get replace ments. I too was told that Sun Mt. makes the bag. I called Sun Mt. and was told they do make the Staff bag but any replacements or repairs are donr by Titleist. I called Customer Service at Titleist explained the situation and within 5days new pull tabs were delivered at no cost. Don't know what model bag you have but I would suggest you call Customer Service at Titleist and find out what they suggest. If you bought this through your local pro-shop they should be able to handel as well.