If something I buy doesn't work I would return it. If I get a new one and that's a dud too then I return and don't purchase a new one.
That being said 3rd party keyboards are glitchy and can't really blame the device.
I have issues on my 6 Plus my 5C and my 5S with aftermarket keyboards. I think they are all junk right now. But just my opinion.
That's weird. I wonder why my 5c doesn't have that issue. Though my main concern is the dropped calls. I hate talking on the phone as I work in a call center. So when I'm on the phone, it's usually important...
So you've bought the newest gadget. Had to go through 2 before the third was perfect.
Then you realize small things like messages freezing when using third party keyboards, apps crashing, calls dropping no matter what LTE setting...
I've already seen two noticeably defective physical ones, I think exchanging this one would be like playing roulette.
I need to step outside of what I think and feel to get some advice on what YOU would do.
Enlighten me?
If you're speaking of iOS 8.1.1 on an iPhone 6+, then I can relate to issues like crashing native iOS apps and other problems.
As for dropped calls, perhaps there's something going on with your carrier, or a bad SIM? I've also read that if the VOLTE option is enabled, that could introduce some interoperability challenges.
iOS 8.1.2 has resolved the native app crashing and is more stable in my experience, so recommend updating to that if its an option.