Q: iphone imessage keyboard disappears

Hey 34rod,

Thank you for using the Apple Support Communities. I see from your post that you are having issues when using your keyboard in Messages. I'd like to make sure you can stay connected with the world without any issues. Let's start by following the steps in this link below and let us know if that helps. 

Are you using a third party keyboard? If so, let's try removing the third party keyboard as an initial step:

Use third-party keyboards on your iPhone, iPad, and iPod touch

Remove, rearrange, or delete third-party keyboards

To manage your third-party keyboards, go to Settings > General > Keyboard > Keyboards > Edit. Here you can remove your keyboards and arrange the order they’re in. 

You can also delete a keyboard by deleting the companion app you installed from the App Store. This will also remove the keyboard from Settings.

Once that's completed, close the Messages app and test for the issue once more.

Force an app to close on your iPhone, iPad, or iPod touch

Should the issue persist, let's try and restore your iPhone 6. Start by backing up your phone to iTunes:

How to back up your iPhone, iPad, and iPod touch

Then use this article to restore your phone:

Use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod to factory settings

Cheers.