Sparkfun USB Xbee Explorer And Adafruit USB Xbee Explorer

I have having few issues with the sparkfun xbee usb explorer only with series 2 xbee(2mW).The issues are giving "Action Required" error or "Unable to communicate with modem" errors .It works sometimes and doesnt othertimes. Are there anyone out there who are experiencing similar problems.I read some posts regarding poor power handling capability with xbee usb explorer.I have not used Adafruit explorer.Any suggestions????

Any suggestions????

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