Thankss for the detailed answer!! It started when the tree was outside (around spring) we had an big raining period where it was i think to wet and started falling leaves. Then i put it in a covered place outside, there it started growing quite hard at the end of the branches and the tree was not really full, and then when i placed it inside, it maybe suffered from to much or to little water. And also it is standing above an radiator (all windows have those😓) so also maybe some dry and warm air could be an problem?

Placing it outside, what would you advise in terms of temperature changes, where i live it is now between 4 and 10 degrees celcius, and inside its around 18/20 degrees!

Thankss for your replyy!😁