The battery thing is a real issue. I’ve tested it a bit more than was probably necessary, but I wanted to make sure.
If you have “low” battery, e.g. < 20% power left, the defeated bug seems to happen exponentially more than when you don’t (when I had the low power, it happened at least 10x more often than it does with more power).
Other things that assist in causing the defeated bug are things that interrupt your connection, even if for a fraction of a second, e.g. text messages, other app notifications that require a physical dismissal, when the low power thing comes up, etc. More often than not would I get the defeated bug when these things happened.
Now if your device actually dies, on the other hand, it’s a simple ‘disconnection’ for which you receive no loss.