My module has been on the fritz for about two weeks after working for a long time. Red led flashes 8 times. "GPRS Network initialization failed". I have tried unplugging the module to reboot. My phone plan still has a balance. The blue led is slowly flashing. I replaced the cable a few months ago when I thought the unit was acting flakey and that seemed to help for a while, ie the module stayed connected more reliably. What should my next step be in troubleshooting? Thanks, Jack