After some time of normal working (10+ hors), most of KDE file manager apps (Dolphin, Krusader, Gwenview) stops starting, with showing those error in output: $ dolphin org.kde.solid.udisks2: Error getting props: "org.freedesktop.DBus.Error.NoReply" "Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken." Restarting system solve the problem and all becomes work well for some hours. Non-kde and console (mc) file manager apps works well, also KDE file open dialogs works too. I understand, that this is too generalized error report, but how can I debug this problem for get more detailed report of problem source?
Upgrading to KDE Plasma 5.16, as mentioned here https://askubuntu.com/questions/1160574/kde-is-broken-after-upgrade-to-19-04-org-kde-solid-udisks2-error-getting-props and here https://ubuntuforums.org/showthread.php?t=2423458 not help, current version: Operating System: Kubuntu 19.04 KDE Plasma Version: 5.16.4 KDE Frameworks Version: 5.60.0 Qt Version: 5.12.2 Kernel Version: 5.0.0-23-generic OS Type: 64-bit