Let me caution you when SOMEONE ELSE does electrical wiring: They screw things up. I found a SERIOUS problem in my home when I plugged my computer into one outlet and the printer into another. My computer was supposed to be grounded at the outlet (as all computers are), but my ground wasn't grounded, it was HOT. I did not know this, since the computer still operated apparently normally. When I plugged the cable from the printer to the computer, I was laying on my back reaching around a corner feeling for the receptacle for the printer cable. When I touched the metal casing on the cable, feeling with my fingertip for the receptacle, as soon as I touched the case - ZZZZZZZZAPPPPPP. I got a major shock. All because someone else swapped the hot and neutral wires, and someone ELSE hooked the (what they thought was the) neutral to ground.
So, you never know what someone else has done. In another home, someone put the switch on the neutral line. When you assumed the power was off, it really wasn't. Again, work by SOMEONE ELSE.
Since I can't examine your electrical system, I can only guess that somewhere someone has hooked something up wrong. I know that if you have a GFCI (not CGFI) - or Ground Fault Circuit Interrupter - and it's not properly grounded, it won't work. Also, if it senses a problem with power feeding back into the neutral line improperly, it will pop. In short, they are designed to work properly on a home that is Properly wired. Since your system keeps popping, something is not right.
Even if you have it properly grounded, the ground can be faulty. My neighbor had his appliances grounded to the cold water line copper piping. He removed a section of this piping and replaced it with PEX plumbing. He mistakenly assumed that the water would supply sufficient ground. It didn't. His wife got a nasty shock from a faulty washing machine in the basement. So, believe it or not, even Plumbing can be a problem for a GFCI outlet.
Really, you have to fully diagnose the entire system before you can identify the cause of the problem.
Good luck. Your problem isn't one I would want to have to fix.