Hmmm?
Your case is quite strange, I've never had that happen to my tamagotchi's.
Possibly, the fall was so hard that your tamagotchi, may have gotten messed up inside.
Uuuh? I don't know how to explian it.
But, I mean damaged inside it's Batterie or some other things deeper in tamagotchi.
There could be lots of reasons like when it dropped.
Somehow the batterie might have slightly moved a bit, causing it to do the strange things that's happening.
Or uuh?
Maybe a way to fix it is um?...
Unscrew all the screws.
Deeper then the battery place and, just posibly you could find out what's wrong and fix it.
But, If you try And do that it might mess-up anything.
Don't say I didn't warn you.
Or another reason, is to go to the FAQ team and ask them.
If they don't have they answer they will probably show you a site that does.
Or a very smart thing to do is
ASK BANDAI!
They will explain everything.
But, if non of those opions work, I am very sorry.
This is all the ideas I have.
Hoped I helped a bit!
\\T.luvfritos99//