I had the same results as soon as wifi turned on the phone froze and then I had nothing but boot loops, I had to nandroid restore and then re-install kernel. Since then the phone has been great. Super fast.
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YOu should have had anothe kernel in sd and flash it isntead of nandroid. Thats what happened to me. Just flashed another kernel in recovery and booted. I guess us Miu users main problem is wifi.