09 prostar, power windows and center panel switch packs stop working.

Sometimes as soon as I start the truck, the power windows (both doors) and center panel switches don't work. Other times they randomly just stop working while driving. All the time the power door lock/unlock buttons are working. When this happened for the first time, I discovered that pressing the power door lock or unlock buttons would make everything work again.
For the last couple of months the door lock/unlock trick does not always fix the problem ( lock/unlock buttons still working).
Anybody had this problem before? Different mechanics had a look at it and don't know what is the cause.
Thank you for your help!
The truck is an International Prostar '09 with 850k. I bought it last year with 760k.

 

Do you think changing the datalink would fix it? Or do you have any ideas on where to look for the cause?

 

I tried unpluging the driver door pod for a while, and the problem did not go away. The passenger side I did not test yet.
I have no idea how the datalink wiring works.
My friend is driving the truck this week and he just found out that the problem might be coming from the wiring just to the left of the clutch pedal, under that plastic...When stepping on that side harder , the center panel switches start acting like the Christmas lights. Also, if the buttons don't work, a small kick in that area would fix the problem.
Most likely it is a wire, like you said. I will take a closer look, and post an update about what I find. Thank you for your help!

 

Thanks for the info. I thought it's just some wires. I will be more careful.

 

Update : There were some exposed wires under the plastic just to the left of the clutch pedal. After cleaning it and wrapping it with electrical tape, the problem seems to be fixed. A lot of dirt under that plastic, and I believe that somehow water gets in there too. Really bad design.