Automatic Transmission Control Module problems of the 2011 Cadillac SRX

I have been having issues with the acceleration of my Srx, this problem mostly occurs when I am almost at a complete stop then I accelerate and nothing, it almost makes me think the vehicle has died. I can also feel a mild clunk when letting my foot off the accelerator. I have had the car in the shop and was told I needed to have the tcm reprogrammed, so I agreed to the repair. I can honestly say that repair did nothing to help the issue. I bought the car preowned and didnt notice the issue for about a month or so after the purchase. The issue seems intermittent, but when it does happen it is scary. Especially when pulling out into traffic and the car doesn't accelerate.