It took me some time to find out what was the problem, which I did, so not really a question, but for future advice I put it here.
I have had some issues with my Pylontech battery that kept disconnecting from the Multiplus 2 GX showing "Not connected". Sometimes it happened 5 times in 1 minute, really annoying. Now I did notice there were high voltage warnings, but I seen them before. Then there was no problem because it gave overvoltage warning already from 52V (15 cells). The real problem started later with the intermitting disconnecting from the MP2. First I thought it was an CANbus problem, but I found out the BMS was shutting down the charge or discharge even when the voltage was at a normal level. It needed a hard reset (with the BMS reset button) to get it out of this loop. Afterwards change parameters for high and low voltage and thats it
