Sunsynk Fault Codes

Hi,

I have 6.8 system 16 panels with split on 2 strings 8 and 8. From the start of installation the system gives F45: AC_UV_OverVolt_Fault.

This could happen up to 10times a day in very sunny day. Loosk like its happening when the system has a lot of sunshine and generating maximum energy.

I checked settings and the max is looks like 253v but it never reach this number and stays around 251-252v maximum buts still triggering the fault.

Invertor is SYNK-5K-SG04LP1, software m3.3.8.6 / S 1.5.1.5 C E.4.3.8

Any idea how to fix it? I have similar setup in another house with 14 same panels and it never gives any trouble, the only difference i manage to found between the system is that the fault one showing flow to the battery which doesnt exist...