Skoda Octavia boot catch opening when i open any car door.

I had had the car for about a month when I noticed that when I opened or shut the driver's door the boot catch would automatically open. Then it spread to other doors that when they are opened or shut, the boot catch is triggered off and sometimes when I close the boot it just re-opens. Sometimes, the boot simply re-opens and because I'm a taxi driver, needing to get somewhere, I have to drive with the boot catch open as I haven't got time to keep trying to shut the boot, and of course the boot is rattling.It is clearly an electrical fault of some sort. I thought Skoda had fixed it by re-setting a code, and it has been OK for several months. However, the problem has started again and it is extremely annoying. I'm not sure whether it has anything to do with the wet weather and water getting into the system. If anyone can shed any light on the problem, I'd be grateful.