Cerbo MK2 - v3.5x - Pylontech BMS no longer working - MPPT not working

Error 67, before v3.5x everything was working fine.
A reboot sometimes works.
MPPT stops producing energy.

Not sure if it’s only on MK2, I also have some installations on Cerbo MK1 which don’t have this problem after the update to 3.5x

Cable (own crimped) is measured and tested good.
Also tested with a Victron type A cable.

im not sure they have figured out a fix as yet as I keep getting the error no matter what i try. What i find annoying is that it isnt straight away, sometimes it will go an entire weekend then 8am monday morning the alarm goes off. Reset and it will go off again 5 minutes later.