I actually have this problem on a couple of the units. These units were purchased on the amazon digi store and vary between 1-2years of age (from delivery). Is there a replaceable battery in the unit?
There is no battery which can be replaced in these units. In fact, opening the enclosure may void the product warranty.
This sounds like the unit has bad flash and is in need of repair. Digi Technical Support should be contacted to determine warranty status and possibly pursue an RMA.