Glitching iPhone Xs max

iPhone X's max went in for repairs and when I got it back , it had same problem in less than a week.of it's repairs, now they booked it in again, and it's still under warranty. I was turned back a number of times since December until it was first booked in to repairs in late January or early February. I am worried that it might give me the same problem after its warranty time frame and then what? I have been to cell c Riverside mall