My 600 has started to switch off at random and then switch immediately back on again but sometimes lock up or go to standby. Its about to go back to Arcam for fixing but I just wondered if anyone else has had this problem? It is not related to high volume and seems to happen randomly, though usually once it has gone though a phase of on/offs it seems to work fine again. Today it did 6 on/offs in a row so its bye bye AVR I will miss you xx. Come back soon I love you.