Why does the turbocharger keep braking down? First I heard allow Replaced both & one is gone again

What is your question?

First I heard a loud whirling sound. Then smoke started coming out the exhaust, got the front turbo charger replaced. The problem seemed fixed. Month later smokes are coming out the exhaust again. I get the rear turbo replaced. The problem seems fixed. I hear loud whirling sound again. The throttle control light comes on on have the throttle body cleaned. Driver half-mile from the repair shop in the car start smoking again no check engine lights nothing. I'm seen on other websites where people having the same problem with these early early model eco-boost engine's but there's no recalls out for my car

How long has your 2010 Lincoln MKS had this problem?

Problem first started around July this year. About 4-5 months. No problems like this before