A perfectly working 3 Phase Quattro ( 5 KVA) system has started switching off suddenly on following errors
Ve Bus error 3 - Not all, or more than, the expected devices were found in the system
and
VE Bus error 25 - Firmware incompatibility
Indications
On Phase, A/L1 only float LED flashing ( could not find the meaning in Victron Toolkit )
On Phase B/L2 and C/L3 LED matching to Ve bus error 3 ( absorption and inverter on LED flashing)
A switch off and switch on of all the three units seems to resolve the error for a few hours
Is it possibel that the error is generated when only L1 phase is not available from Grid ? but the Ziehl islanding should also detect that error
Following checked
A. Any changes ?- System is operation since last year - no changes in hardware and only Smart solar /venus firmware upgrades
B firmware
All smart solar ( 2 no.) are on V 1.42
All three quattro's are on V430 ( device 2657)
Venus is on 2.33
C. Ve bus cabling - seems to be firm and no issues detected - changed the sockets just to be sure on Phase A/L1
D. AC and DC cabling - no fault detected on a visual inspection and AC/DC voltage checks ok on all terminals
Video - https://youtu.be/lFF-Fo6UvG4
Picture 
