When you say "old" it depends on just how! I agree with what Tasos states that it could well be the actual control (if a rotary type) requiring replacement, or the much easier and commonly done thing of giving it a good squirt of cleaner / lubricant, like for example WD40. If it is the old rotary type, give a quick blast of the WD40 into the gap on the side of the covering can where the leads come from the solder pins, if you do this properly it should last for another few years. The problem can of course be caused by other things, and if it isn't the actual control itself it definitely suggests a bad connection somewhere, rather than a component fault.

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