Quattro 10kw switching on and off when connected to grid

The local substation was burned down and since the new transformer was installed my Quattro 10kw inverter does not seem to like the power coming in from the grid. It switches some circuits off and others have very low voltage and also will switch on and off. As soon as I disconnect the grid the system works perfectly from the pv. The voltage is within acceptable range of 220-230v but I am not sure what the frequency is and if there is voltage drop in milliseconds. Is there a way to adjust the parameters for the power coming in from the grid? And is this safe to do if possible