Edge 830, Power Icon remains on switch off

Anyone had similar to this?

Fully charged 830 and switched off, went to use a couple of days later and time has gone way off, battery almost flat and power Icon displayed on Garmin screen. After a charge the GPS struggled for an hour before finding a signal, the unit later refused to take a charge but was syncing with connect on the computer and app. This Unit was replaced.

I have noticed that on occasion the Power Icon remains displayed when the unit is switched off, on trying to switch on the device is unresponsive and requires a reset and a connection to the GPS network to sort the time out (syncing the device did not correct the time)  I presume this is causing battery drain as the power has been close to zero on a couple of occasions?

Anyone had similar problems or aware of a fix for this?