Q: My Iphone 6 types randomly.  I push the Messages icon and the Health icon opens.  I try to type the letter l and it might type zzzhaioweralksdjf.  If I am on the internet, I cannot type or tap the screen.

Hi LorrieWood,

Welcome to the Apple Support Communities!

I understand that the your iPhone displays random letters when you try to type on your touch screen keyboard. It also acts unexpectedly when you are in certain applications by not recognizing any touch input. To begin troubleshooting this situation, I would recommend working through the steps in the attached article below. 

If the screen on your iPhone, iPad, or iPod touch doesn't respond to touch - Apple Support

Fix your touchscreen

Make sure your hands are clean and dry, then try these steps:

1. If you have a case or screen protector on your device, try removing it.
2. Clean the screen with a soft, slightly damp, lint-free cloth.
3. Unplug your device.
4. Restart your device. If you can't restart, force your device to restart.

If your touchscreen still doesn't respond like it should, contact Apple Support or take your device to an Apple Retail Store or Apple Authorized Service Provider.

Best regards