Troubleshoot: Multiple numbers input on single key press

This one's a little weird. Sounds like dirty keys, I know, but...

I was taking a look at my dad's 8700, and whenever he tries to input a telephone number, some of the numbers will show up twice (get it? ;). But it happens in a pattern. Every other number, starting with the first, is doubled.

For example, I try to type:
1234567890

I get:
112334556778990

Sometimes numbers get replaced with other doubled numbers, but you get the gist.

I'm at a complete loss, I don't even know what to search for. Any help, please. Any extra info needed, please ask.

Thanks in advance!

Take out the battery with the phone on. Leave it out for about 30 seconds. Put it back. Among other things, that will force a rebuild of the indexes and reload the operating system into contiguous memory and may fix the problem.

When you pull the battery, there is a very slight risk of corrupting your OS, resulting in your having to wipe/reload your device. Be sure to perform a backup before the battery pull, if you can. If you can resolve your problem by a soft reset, Alt-R.Shft-Del, you should. You should only pull the battery if the phone is locked up, or you can't soft reset, or soft reset doesn't solve the problem.

Same old problem, both resets. No worries, it's a company phone, they'll send out a new model anyway :)

Thanks for the quick response!