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This is quite old- I would not be pouring a lot of money into it to keep it going. The biggest issue with these are the wire harnesses. IF any ends look overheated then you will need to replace them as they are not making good contact. The drawers use the same parts, so you could have simply swapped parts to find your issue instead of buying them first, so you may want to try that to resolve this issue. The motor can also be an issue here, so swap the drawers and see if it works like that.
Anything can fail and there is a hall sensor on the motor that can fail as well. Swap the drawers out as that will help you figure out if the wire harness is an isssue or not. If you methodically do this you will find the problem. There is no more in-depth info I can give you as nothing but swapping parts here is going to solve this since there is no testing that can be done.