This is a pretty basic thing to fix, but sometimes beginners have this common problem and lack the knowledge required to fix it.

Okay so, the most common mistake which causes bars to slip is mis-tightening the front bolts. Here are some pictures to show how it should and shouldn't look when fully tightened:

This is what it's going to look like when it's fully tightened if you've done something wrong:



If you've fully tightened them right it will look like this (If yours looks like this, and it's still slipping see "Other Tips" at the bottom of the page):



What you are really aiming for is to have the space between the stem body and the front piece equal above and below the bars. To do this, grease up your bolts and put them in just finger tight to hold the front piece on. Next you'll want to tighten one of the bolts up about 1/4 to 1/2 way from fully tight. Now tighten the bolt diagonal from the first one the same amount. Next is the one above or below the last one. Tighten it the same amount as the others. Now go to your last bolt, the one diagonal from the third one and do the same as all the others. Repeat these steps until you've got them all tightened up evenly. Now you can check to make sure the spaces are even. If they are you should be good, but if not, you might want to go back and try again.

Other Tips:
Most of the time, tightening it down evenly will solve your problem. But in some cases, your bars might still slip.
If you find they are still slipping, try taking it apart and lightly sanding the paint (if there is any) off the part of your stem which contacts your bars. If you want to really assure that your bars aren't going to slip, you can also lightly sand the paint of your bars where they are knurled to grip the inside of the stem.

Hope this helps someone!

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