Wellsyboy

Hi just bought a 2007 8P 170 S Line got a few issues that were known about one that wasn’t. The electric windows go up & down ok then won’t work usually when they are down!!!!!! Strangely if I completely turn off the car & re start it they work so something must be resetting. Guess like most things it will be a known problem so apologies if this is an old story. How do you fix this??? new relay???