Well, on the same raspi the old wallet worked great and only the newly compiled one had issues so not sure SD-Card is to blame in my case at least...

Explanation of -detachdb (and the new “stop true” RPC command): The Berkeley DB database library stores data in both “.dat” and “log” files, so the database is always in a consistent state, even in case of power failure or other sudden shutdown. The format of the “.dat” files is portable between different versions of Berkeley DB, but the “log” files are not– even minor version differences may have incompatible “log” files. The -detachdb option moves any pending changes from the “log” files to the “blkindex.dat” file for maximum compatibility