When I started my game yesterday there was a weird bug, my sims are jumping in the air and the interaktion is called "to be surprised" or something. and they 'scream' a little.
I already know the "jumping-bug" , but this one is different.
I have not downloaded anything new.
Everywhere I look there is only the jumping-bug..
I wonder if anyone know this bug and can even help me?!
my solution would be to let the whole family move out and back in again. but I've been playing this family over many years and there is so much stuff in the house I hope there is another solution.

This is something that Sims do sometimes. They'll react to an age-up that way sometimes, or if they see someone naked, or to a birth, or to a nearby lightning strike, or if they witness a witch casting a spell, or...Well, lots of things, really. I find that some Sims are more easily startled than others, so reactions vary. So unless this is happening constantly or for no discernable reason, then the startle reaction is normal game behavior.

It might be a stuck emitter. Either have a look on the bat box to see if an option has popped up to delete it or move in-out with the family.

Try the option on Batbox for Ghost Emitter, sims will sometimes 'freak out' at random objects with no ghost there.

thanks for the tips! I will try it in the next few days. hope it helps

it's now a month ago but I wanted to say anyway that it works! I tried the "ghost emitter" option and it helped. thanks!!

If that is the case then you need BO's mods.

1. BO - No Sim Loaded: Remove a lot of junk controllers, tokens, and other broken stuff, without the need for a Batbox.
2. BO - No Trash Memories: PREVENT gossip and silly repetetive memories from being generated. (You may or may not want.)
3. BO - No Met Self Memories: Stop the "Met Self" memories without the use of NTM or Pescado's Dramafix. (This one is new to me but looks good.)

http://www.simbology.com/smf/index.php?topic=7875.0

I will keep them in mind thanks
it's probably a stupid question , but what do you mean with "met self memories" ? I can guess but it never happened to my sims

The memory will say they met a new sim except the sim they met was themselves, it can cause issues.

You should not play without those mods Marka mentions above; they keep your game safe and prevent your hood from blowing up into space.

so I might download them right now. thank you

Speaking as a player who has seen a hood vanishing into space once