How to prevent your modem from getting 'bricked'

[cj47]

I have yet to see any 'sticky' on this so here are my questions;

1. Why are these so susceptible to getting 'bricked'?? Why would a couple of short cycle power interruptions 'brick' one of these?
2. Is one hacked firmware more prone than another and if so which is the least likely?

Tnaks.