Ertiga Diesel वेरिएंट में Beaware of power loss issue

Beaware of power loss issue in Ertiga Diesel variant

I own an Ertiga Zdi for last 8 months. Since last 4+ months, I am facing issue related to loss of power. The car has visited the service center 4 times. Issue has recurred every time I took the car back. Below are the issues: 1 - Loss of power at 1.7 to 2K rpm followed by lot of smoke at exhaust - occurs when AC is switched on 2 - considerable vibrations at 5th gear just before power loss 3 - Steering jammed while pressed the clutch to bring it back to lower gear followed by power loss from engine. After I engaged clutch, the power came back to steering. My dealer is cooperative and helps me out in terms of providing a standby car and working on the problem with Maruti engineers. But the problem persists till date. I have lost confidence in the car and Maruti service.