Vauxhall Corsa car keeps cutting out

Car starts no problem at all runs well but cuts out and wont restart untill three quarts of an hour to a hour later. After that may run all day then next day may cut out two three times a day, does not cut out when leaving car to idel for an hour or two but cuts out when driving. When trying to start car after cut out its as if there is no spark or petrol . Have replaced fuel pump relay, plugs, checked all wires, seems to be when engine is hot but not overheating