electrical gremlins

[humptynumpty]

OK here goes when i bought the car the cables for the drivers window had broken and well snagged around mechanism and passengers window didnt work either, so i checked fuses and replaced missing fuse.
Now passengers window goes down smooth and jerks up but it goes down whenever it feels like it, doesnt do it if car hasnt been used but if car has been used it sometimes goes down as car is locked.
Also it only goes down randomly when engine is running and more so if reverse is selected (you flick switch to get it up and it goes straight back down) and also the reverse sensors are somtimes buzzing all time as if something is less than a foot away and nothing is near back and more so when window is playing up.
I wasnt sure if the broken cable in drivers door could possibly cause an earthing problem or not also boot had 4" water in wheel well so im not sure if its a damp problem but it is becoming anoying now, so any clues were to look will help alot thankyou in advance