Indesit WIL103 stops with Flashing Leds?

We have an Indesit WIL103, 1000 spin which is about 18 months old. Recently a number of the programmes stop after the wash cycle and the Delay Timer and Door Lock Leds flash rapidly (no sequence just a continual flashing). We have to switch the machine off; manually select the rinse program and start it again. The hot wash program doesn't suffer the same problem, and works fine. Does anyone have any ideas as to what this could be?