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Yeah 5ghz wifi issue has still not been resolved 100% for me. But it's been better since 8.1 beta 2. Hope Apple manage to sort it for final release.
 
Guys. Try to fix your wifi channel. I tried it half hour ago and it's my best wifi experience since upgrade to iOS8
 
I gave switched it 5ghz frequency off on my router - my ipad (mini retina) kept dropping signal. No issues since switched off.
 
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