Interesting, I was having this same problem, but it only happens during debugging (at least you can only see the error then).
So I was just avoiding debugging, and accepting that we still get random reboots. I updated to the latest firmware yesterday, and while I haven't tried debugging yet, my modules are still publishing with no reboots so far.
The longest module has been publishing now for 1 day 7 hours without a reset - a new record!
I'll test the debugging tomorrow and see how it goes. I'm also testing the 120 module battery life, with high hopes.