I have been called out to 2 problems with ovens (not the normal need to reset clock) after a power cut the oven controller screen was blank as if no power going to oven, checked them out and power to everything up to the electronics , power into that but nothing else, seems the board is dead but 2 days later it comes back to life all by its self, I then had the same happen to my oven, first time it took a day to come back second time a week, my one is a Brandt (made in France) others cheap units not sure of brand, anyone had same problem or a idea of what it is and why it comes back to life?