Why is my clock changing the time setting all by itself? on 2002 Volvo V70 XC

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac
I can set the clock though it isn't always easy to do. Sometimes it does what it is supposed to when I turn the "stick" and other times it just takes off running forward at full speed no matter which direction I'm turning the control. When I do get it set it may only stay set for a couple of hours, sometimes longer, before it takes off and advances to another setting.
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