Nuevo radio

I bought my 2006 Nuevo before christmas and driving it home I was surprised when the radio switched itself off. On reading the manual I discovered that there is a Radio isolation switch that has a sleep function and assumed that this had caused the problem. Whilst preparing for the new season today I had the radio on, I think the switch was illuminated, and after a while it switched off. Then switched on again and went through several quick on/off cycles. It now will not work at  all, no radio or cd. Anyone else had a similar problem?

Our radio (2006 Nuevo) switches off after 20 minutes whilst driving or stationary. The override switch under the cocktail cabinet prevents this whilst stationary but we have to remember to switch that off otherwise the battery drains even when radio switched off (apparently, never left it on to try so far). The radio is wired to the leisure battery on these Nuevos.