First of all to avoid your topic from getting locked, please use English language as per the code of conduct.
Even though I doubt all the issues you are mentioning are in fact happening to the vanilla G1000, there is a community improvement mod you can install and, I’m telling you, it makes the G1000 work amazingly well. You can find that in this subforum, pinned topic “community aircraft mods megathread”.
Thanks for letting us know.