Dropping the phone could cause all sorts of problems. Don't do that. I've seen phones ask for the Windows Install CD to put into the CD tray after being dropped.
If you have Lumia Cyan and this is happening, contact Nokia and see what they can suggest. Worst case scenario: You hard reset your phone.
If you don't have Lumia Cyan, wait until you have Lumia Cyan. If that just isn't an option, then contact nokia support and have them show you how to roll your phone back to 8.0 until you can get the new update with the firmware.
Enjoy.