#1 and #2 sound like either a bad battery or a bad charging circuit board. I agree with Gogolo, you should contact iRex support ASAP and see about getting it repaired before your warranty runs out.
Several other people (including myself) have had a similar problem to #3. On mine, it works best if I don't push the switch 100% of the way over. If I aim for somewhere in the middle or 3/4 of how far the slider will go, and hold it there a second, it'll turn on or off a lot more reliably.
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