[cbloom]

In theory, if they actually have infinite stacks, even if they get in as 10% to win each time, they'll eventually take your whole stack.

While this probably isn't the case, if you really are afraid of this, one solution is just to cash out whenever you double up, then buy back in. I really don't recommend this, it's very bad for your EV, but if you're playing scared or frustrated from running bad, it can help calm the nerves.