I got my Yocan UNI Mod about two weeks ago. My question is how often do I switch out the magnet piece that screws on the bottom of the cart.

I got my yocan two weeks ago. It’s hits half gram carts perfectly fine but struggles with full grams. Is this normal. Also am I supposed to switch out the magnet ring after a certain amount of time. This is my first vape as well and what are some basic rules to keeping it clean and running smooth.