@picree: Rebooting while plugged in will *definitely* throw you back in to diags, that's just CRP doing its job
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As for the reboot after an install, that doesn't happen if you installed it through MRPI, which you probably did.
(That's relevant here because there may be an issue with the CRP checks on the Oasis, which are currently a little greedy, they probably match on more conditions than they should, hence my comments about the cover and OTG [i.e., the Voice thingy dongle]).
They definitely shouldn't match with a "naked" Oasis, but since all of this was mostly blind-coded, I might have screwed things up.