Cheers @dubbleRR I'll take a look at the relays and see what I can do. The fault is intermittent. Sometimes it works fine for days.

I've narrowed my fault to the car down to these relays. I've ordered some replacement relays, but i'm not sure if there is a fault with the fuse box itself. There seems to be some mods to the fuse box which improves the power supply to the car...

Hello did you ever fix this issue? I have the same problem.