Every few weeks I come home from work to find that the clock on the electric oven has re-set to zero and a plug-in RCD used for the washing machine has tripped (machine not in use at the time). Yesterday the same thing happened but also the phone was showing 'Power Cut - re-set time?' All these appliances are on the same circuit not protected by an RCD at the CU. The RCD protecting the electric shower did not trip (sub-main on Henleys). We have no problems for weeks and then this happens randomly, usually during the day. There were no power cuts (I checked with UK Power) so any ideas would be welcome. We will call an electrician if this happens again as it's time to upgrade the CU anyway.