There is a new firmware that we released recently (1.0.7) which compiled the code with ESP8266 core 2.3.0, and that may have addressed the connection issue.
I have prepared a zip file that contains necessary tools to reflash the firmware through USB. Please download it here:
http://raysfiles.com/og/ogflash.zip
take a look at the README.txt and give it a try to see if it works.