I have an OpenSpot 4 that every few days it will not power on. The only way to power it up is to connect it to a computer. I know it is not the battery level since when I plug it into a computer the battery level will show 70% or more. Once plugged into the computer, then removed it will usually work fine for a few power cycles for a few days, then the next time I power it on it will not power up. This is a problem when mobile since to get the OpenSpot 4 usable again I need to plug it into a laptop. It then comes alive and is usable until the next incident a few days later. Is this normal or is there some kind of issue? Is there a setting I need to change?