I have been using the istick basic for a week and it just recently stopped charging. When I plug in the micro-USB, it blinks a couple of times but it doesn't flash red like it says it should in the manual. It only does so when I press the fire button and even then, the red light switches off in 2 or 3 minutes. I have tried different cables and sockets but nothing changes. Is there anything I could do to fix it?