over 10 hours my MNs where ok, now the daemons died again :(
Edit:
this are the last lines in the debug.log before shutdown:
2015-08-16 23:46:31 dumpaddr thread stop
2015-08-16 23:46:31 addcon thread interrupt
2015-08-16 23:46:31 opencon thread interrupt
2015-08-16 23:46:31 msghand thread...