It is propably related to decrypting large (single) tar-files. It works flawlessly when renaming the tar-files to another extension before encrypting and afterwards decrypting it again. But as long as it is named xyz.tar Kleopatra crashes. Could it be that untarring causes some "out of memory" failure? I recognized that while decrypting the tar there was no sign that the decryption process would allocate any disk space. There is just an empty randomly named folder being created upon decryption.

I hope I did not choose inappropriate action in commenting here that I also would highly appreciate a cache timeout for OpenPGP Cards to reduce the exposure time of already unlocked card's keys. Would be great to get such an option