What Causes My Main Power Switch To Shut Off?

[Boris_yo]

Main power switch in my apartment is shared between me and neighbour. He is connected to my power source and has separate electricity counter. In our apartment's lowest floor about 4 months ago moved in computer and technology specialized shop just for a fact. This shop has 3 satellite antennas on apartment's rooftop and just to mention my neighbour also has 1 satellite antenna. Today our main power switch started jumping down and prior everything was alright. I suspected LCD TV, digital decoder, Printer/Fax and DSL modem to be culprit and tested this but everything was fine when i shut down them all. Also i have Haier fridge that often produces strange sounds, like something is falling in it or gets hit within. I can't test this with fridge because food needs to be preserved in cool environment.

What can be the problem here? What would you suggest?

Thanks.