Flukso 2 MQTT stop working

I had flukso working for a lot of years but now every 2-3 days I see MQTT stop reporting any data.
Killing demon and restarting it helps but in 2-3 days it's dead again .
Anyone could suggest on how to troubleshoot it ?
So far i didn't find any specific issues at all . Only strange thing i see is in Sensor config synchronisation section date is still 1970 even so system time is correct.
Any recommendations/suggestions ?