2014 Buick Enclave

I have a 2014 Buick Enclave, I am getting a reduced power and traction control light and the check engine light while driving this car. Pull over and let it sit with the engine off for 20 seconds turn it back on and it’s fine.
I changed the throttle positioning sensor and the throttle body also did a relearn on the positioning sensor. Runs good for a couple of months then starts doing the same thing again.
What am I doing wrong or do I need to do something else besides trading this car in!!
This is an awesome family car so I want to fix it. Any advise????