ipad air keeps typing, switching between apps with out comands

If this did not help you may try restore your device to factory settings. Note that this will erase the data from your device.

Take a look this Apple Support article: Use iTunes to restore your iPhone, iPad, or iPod to factory settings - Apple Support.

If this will not help restore it as new: How to erase your iOS device and then set it up as a new device or restore it from backups - Apple Support

You may also take your iPad air to the Apple Store. They will offer you the best solution.

That may be a hardware problem with the touch screen.

You can try the standard troubleshooting steps in this order:

Take off any screensaver installed.

Restart: Press On/Off button until the Slide to Power Off slider appears, select Slide to Off and, after It shuts down, press the On/Off button until the Apple logo appears.

Reset: Press the Home and On/Off buttons at the same time and hold them until the Apple logo appears (about 10-15 seconds). No data will be lost.

Restore: Connect your device to iTunes on your computer, backup, and then select Restore to Factory.

See here for more details on restore: https://support.apple.com/en-us/HT201252

If none of these work your device may have developed a scree problem. Contact Apple Support: http://www.apple.com/contact/