I am currently experiencing the same problems. It got better after I turned off the tracing, but I still get it a couple of times every day. Its frustrating when chatting when the phone just decides to pick a different key than what I have pressed. It dissapears if I restart or wipe the screen, or just by it self once I close other apps that might be open. Mind you, this also happens when its only one app open. I have two Xperias, a Z1 private and a Z at work, both have the same problem from time to time, but my Z1 seems most troubled by it.
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