Glo Kobo Glo freezes every couple of weeks

I've had my kobo glo for a couple of months now. I love it, it goes everywhere with me and I've logged nearly 150 reading hours on it. However it has a problem where it freezes in the middle of reading every so often. It will just suddenly become completely unresponsive and only a combination of manually resetting it and plugging it into something will revive it. Does anyone else have this problem? Any fixes? It's very jarring having my reading interrupted without warning, and it's fine the rest of the time. :/ I have software version 3.1.0.

Thanks!