My sister-in-law has had this phone for a couple of days. When trying to type using the qwerty keyboard, when she hits backspace, it types five letters instead of backspacing. The same five letters everytime. It doesn't do this when using the virtual keyboard. We have tried a reset to factory specs. The first two or three times we hit backspace, it worked, then back to the same problem (and same letters). Is this fixable or does she need to return the phone?