Electrum keeps forgetting unconfirmed low-fee, but wallet-relevant transactions. This has cost me several thousand of Euros, because if Electrum forgets them (and I relied on it) I can't even do CPFP to make them confirm.

I now need to effectively save all incoming transactions to a file because I don't trust Electrum any more in keeping them. On some of those cases I tested for double spends – no one was double-spent by the sender, so they were still perfectly valid.