PF150 Pen - Nib keeps falling out

I've had a Q11K tablet for roughly 2 years now. I don't know how long these kind of things are supposed to last, but I feel like this is pretty short for the pen to be broken. I take good care of it.

As the title says, the nib continuously falls out. I'm hoping the nib is broken and not the pen, but I only have one so I can't tell. Even if I do something as simple as turn the pen upside down (nib facing down) it will fall out.

Is there a way to fix this or will I have to purchase another pen/nib? If needed, I can send a video of me trying to put the nib in.

Thanks.