Is it the oven door?
I bought a brand new cooktop and gas oven and had the same problem with tenants using it. Within 6 months I had the Westinghouse (its actually Electrolux) come and fix the oven door. The door moves and leaves a gap
When the tenants moved out, they paid for professional cleaners to go in and clean after them and once again the oven was damaged by the professional cleaners leaning on the door to clean inside the oven.
This time, I was there when the repair chap came. It took 10 seconds to fix!!!!
Apparently the metal is so soft on the oven door that if it bangs or anything is placed on it, it will move.
All the repair chap does is removes the door, puts a chisel in the hinge space and moves it back to where it should be!!! Then replaces the oven door.
He then checked the door was closing and off.
Hope this helps
Chris