You should be able to downgrade to 3.14 as you said, there is a link to it in the firmware thread, and then just leave wifi off while you test it.
My thinking though is for a new firmware to be out before the reader is actually in many hands is that there was something equally or even worse wrong with 3.14.0.
The only problem I see with 3.15.0 is the slower page turns unless you repeatedly keep turning pages. If you do that, you can see the Glo HD is more than capable of doing speedier page turns. And in the meantime, I just start the page turn a bit sooner than I normally would while reading which solves the problem.
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