Areinu- Have you tried, if there is any way, to install the whole firmware again? are there even factory images for the t68?
For the dead device from one day to the next, try using an app to detect Wakelocks, there is probably some rougue app keeping the device awake.
As for the bootloops, I am inclined to agree that it seems like a hardware failure, once the battery reaches a certain level it just might not give out the same ammount of "power" as when it is fully charged , but then again android is a fickle beast and software might still be at fault, maybe try changing the cpu profiles with Setcpu or something like that, the device might be trying to save battery once it reaches a certain level and that causes it to freeze. is Log cat any help? there must be some way to track down that error.
I do not own a t68, just know a little (very little) about android and am interested in this device.
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