The day before yesterday I started to get my amounts on the new device.
I let Electrum work 13 hours yesterday for 206 inputs. When Electrum has finished signing, it is important that I unlock the ledger quickly beforehand, otherwise the error message I posted above will appear, so you always have to make sure that you are on the computer at the end of the procedure .

I now only have coins from 40 entries (previously around 500) on my ledger.
I'm just sending 20 more to my new device but it's still taking a very, very long time.
The inputs are now greatly reduced, but ledger has saved all transactions and the list has not gotten any smaller.
Is it because of that?

I'm curious how it behaves when getting the other coins over, I hope it works better/faster.

Then I will reset the old ledger and set it up again and see if everything works normally again.