FZ200 - Request to switch off, then back on

This has now happened 2 or 3 times.

I leave the FZ200 powered on (rarther than continually switch it off & on), so, during periods of inactivity, it will go into sleep mode after the pre-determined time.

However, in these 3 instances it has shown a message to switch off & then back on.

Never experienced this with the FZ100 - any ideas?