Ring Main Circuit Breaker Keeps Tripping

Last night at 10pm the mini breaker feeding the ring main 32a tripped.
Ring main circuit breaker keeps tripping. It trips for no apparent reason and often when we are away so not due to toaster or kettle. Ring main keeps tripping found three sockets metal back boxes with condensation in them which is dried out ring trip again. My new website on diy. The first thing is to find out when it tripped in other words did they turn anything on and that was when it tripped.
Does your electricity keep switching off. For example if you have a 15 amp circuit with 20 amps worth of electricity running through that same circuit because your hair dryer tv and air conditioner were all on at the same time then the circuit breaker will trip to prevent overheating. This is a fairly common thing to happen yet can keep you searching for hours especially if it is an intermittent fault. This will lead to the overheating of the circuit which puts all the electrical appliances.
Only the main circuit breaker trips not the individual breakers. This video gives some simple things to check in order to find what is causing the problem. The rcd earth leakage device keeps on tripping. This occurs when you want a particular circuit to provide more electricity than its actual capacity.
Sometimes when it trips and we switch it back on it only lasts for a minute before. I have unplugged every plug from the sockets on the ring but is still tripping. Which means it is now a radio trip again. A circuit overload is one of the main reasons why circuit breakers trip constantly.
We then removed the rest of the legs in the ring except two the first socket on the ring and the second in the upstairs bedroom. I tried resetting but it wont even lock on now just trips to the off position. Took the face off ever socket on the ring main all wiring correct and sockets dry ring keeps tripping.