Fact remains that a freezer on its own circuit that suddenly leaks enough to trip it's own RCBO is likely the cause and probably safer off until it can be checked. It would be nice to be alerted but sharing the RCD / RCBO with other circuits adds to the chances of nuisance tripping risk from something else.
under the above conditions, there is something wrong with appliance Bru, but losing freezer because of a build up of earth leakage from a combination of appliances, which is what normally happens, is extremely annoying.