Musso Ice cream maker freezes and then heats up...

Question

I have a 2 qt musso Ice cream maker. I turn the maching on and allow it to freeze for about thirty minutes and then I pour my cold base into bowl. Initially it starts to firm up but then the machine begins to heat up and eventually gets so hot that it no longer freezes the ice cream but starts to melt it. What can i do to repair this machine. Its about 2 1/2 years old but it has only been used about a doz times and it does this every time. Help