So, I just got a Brinsea Octagon 20 incubator from a thrift store for pretty cheap compared to it's brand new price. It is in really good condition and even came with a hygrometer-thing and a candler, but the auto turn base isn't working very well. Instead of turning about three times a day, it's just constantly turning back and forth. How do I fix this? There were no directions in the box with it.