Antwort auf: Langsame Unterzeichnung des Ledgers
This is a [known issue when trying to sign a transaction with a large number of spent UXTOs](https://support.ledger.com/hc/en-us/articles/360018969814-Receive-mining-proceeds?docs=true), but only 12 UXTOs causing a problem does indeed seem very strange. Hopefully someone from Ledger can comment on this…