Bindings are generally internally permanantly lubricated. But as said it would not be a hnderance to use some binding lubriacnat. I use Holmnekol Binding Lubricant spray.
What is vastly more important, although you didn't say what binding you are using, is to lubricate the track the binding slides in, particularly the heel. Sluggish heel rebound can cause unwanted pre-release. You flex the ski hard for example in the trough of a bump and the heel piece can't return quickly enough to it's preflex position and there is not enough force as the ski rebounds to keep your heel in. (In essence your heel piece is barely in contact with your boot.
From Vermont Safety Research:
The FLEX Effect -- Inadvertent releases experienced by racers and hard/fast skiing non-competitors are often the result of the inability of toe and heel piece to stay the same distance apart during rapid flexing and counter-flexing of the ski--what we call the Flex Effect (or the Effortless Release). The most common cause of this problem is a sluggish forward pressure mechanism in the heel piece which can cause a gap to form between boot and binding and thus allow the boot to escape without releasing the binding. Cranking up the release adjustment screw at heel or toe has no effect on this phenomenon and may even exacerbate the problem
A Sluggish Forward Pressure Mechanism In The Heel Piece -- If the ski continued to go in the same direction after you two parted company, and the heel piece was found in the closed position, it could be the Flex Effect. Many times your mechanic can solve the problem by simply cleaning, lubricating, and correctly adjusting the forward pressure mechanism. With certain binding models, however, interference between the underside of the heel piece and the top surface of the ski may require the use of shims (small washers) to raise the heel piece slightly.
Thick Lifters And Soft Skis -- But the problem could also be complicated by excessively thick lifters under the binding or a ski that is very soft under foot. If you feel you need lifters, you should consider binding models with a lifter function built-in, and if you are partial to really soft skis, your best bet may be a binding model with a band or bridge connecting toe and heel piece, designed to allow either toe or heel to float with respect to the ski. These free flexing models make flex/counter-flex much easier for the heel piece to handle.
The HOUDINI Effect -- On the other hand, if the heel piece is found in the closed position and you are pretty sure from your own trajectory (after you and the ski parted company) that you were leaning forward at the time, the problem may be insufficient forward pressure. In this scenario, which could be called the Houdini Effect, the heel piece begins to open and thus presents an inclined plane to the boot's heel ledge. A little counter flex of the ski can also help to increase the mechanical advantage of that inclined plane, which then drives the heel piece rearward, thereby allowing the boot heel to escape upward from the heel piece. Since the heel piece did not actually release, the heel lug magically snaps back into the closed position, thus hiding its involvement in the affair. This condition can usually be reproduced by a binding mechanic with the aid of a ski binding test device. If the Houdini Effect is confirmed by the mechanic, the solution is usually to clean and re-lubricate the forward pressure mechanism and then increase the forward pressure adjustment. However, if the forward pressure spring is damaged or weak, for whatever reason, you may have to replace the heel piece or more likely, the entire set of bindings.
The JET Effect -- Insufficient forward pressure can also lead to an inadvertent separation of the boot from the ski binding during a (pardon the arcane terminology) jet turn . In this case the ski leaves your boot and shoots up and forward as you come off the mogul. This Jet Effect can occur with bindings that offer upward release at the toe as well as with models that are not designed to release upward at the toe at all. However, the problem is most often encountered among models that control upward release at the toe with the forward pressure mechanism of the heel piece. Because the ski flexes dramatically as you come into the mogul and then counter-flexes as you jet from the mogul, the real problem may not be just a weak forward pressure spring, but any of the problems associated with the Flex Effect discussed above.