Same here with my iOS 8 iPad Air. It's, literally, unusable now.
Have to type this on my iOS 7 iPad Mini.
I have a feeling something big is happening & we'll learn more as today goes on!!
Join the club! I got 2 defective 6's at launch right now! Ridiculous and spooky! Mines doing weird stuff. Siri just starts talking while it's on the table! Apps open!
Erm, it definitely is useful to get a feel for how many others are experiencing this. Unlike the 8.0.1 issues on iPhone 6/Plus, where everyone piled in to say they also lost service and Touch ID, only two people including OP have this issue in this thread.
OP, I have an iPhone 5 and haven't seen this. dannyyankou's advice was perfectly valid. You've tried the factory reset, now take it to an Apple store or go to the Apple website to log a support issue.
edit: Just thought something you could try. Try enabling or disabling the 'Change with volume buttons' in Settings > Sound
Hi there I have tried the enabling/disabling button, it makes no difference the volume still goes up. It has been a bit less today for some reason but still annoying
I have ios 8 on my iPhone 5 and iPad Air. There are a few small issues here and there. However othing close to what you guys talking about. I would think its a bardware issue and get It checked at Apple Store.
----------
Also it could be some software not playing nice. So please look into it.