Hi Drelix, what firmware version is it running? (You can find out by going into Settings, then the option for Device Info.) If it's not 3.19.5761, then you should be able to get it to update by plugging it into a PC and running the Kobo Desktop.
Reason I ask is that some people noticed this behaviour with the last couple of versions of the firmware. (I did, for instance, but it was sporadic.) The firmware 3.19 seems to have resolved the issue on my Aura HD (which is an earlier version of the H2O).
I can't promise that that's the issue, but it's worth a try.
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