Play siege. It's not completely random, there are some conditions involved for sure.
Yeah definitely not random, but they never stated how it works.
I personally think there's something to do with swapping gear. The more you change it the better. If I wear the exact same gear 100% of the time I rarely seem to get it. It I swap stuff frequently, I seem to get it more.
The last one I got was at the EXACT moment I picked up a loomed jarid from the ground. The very millisecond I picked it up, I got the text.