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Where you already have everything on your truck for the stock TCM and wiring it's hard to suggest going a different route. A full aftermarket TCM and wiring harness for your transmission would cost $750. I have personal experience with the Quick4 TCM and like it a lot. If you are handy at all...

I don't have first hand knowledge on the TCM but in general that type of intermittent issue is probably in the power circuit or some wiring. The TCM can go bad but if it intermittently works that is likely a wiring. Also any time the transmission loses control signals the default is 2nd gear...