NHTSA Complaint #11430033 — 2016 CHEVROLET IMPALA

After starting car (and sometimes put in reverse), steering appears locked and message says to get power steering serviced. After putting back in park, power steering starts working. This happened multiple times last few weeks. Took car in to Joe Johnson Chevorlet (Troy OH) for scheduled next morning service. After 2 full days of excusses why they couldn't get to our car, we picked it up and took it to independent service shop. He test drove it and steering was fine. Got car back and next day it happened multiple times again. Took it back to independent to run code, which did not give exact problem. Drove car 1 block and power steering went out turning. Then again 1 block later. It is now parked and afraid to drive it. Chevy seems not to want to work on it and independent does not know what is wrong, said it could take him up to a week to trouble shoot entire system. He hasn't got back to me yet. HELP! Also, parking brake seems to engage by itself overnight. When starting car, sometimes it is on. We never use it. This may be related.