Hi Alzhao, my 300M16-ext has done this in both AP mode and in Repeater mode. I bought a dual-boot NAND used AR300M-ext on ebay a few weeks ago. It’s been working flawlessly for over 9 days so far without hanging up. Im using the NAND flash at the moment. Same power supply I was using when the 300M16-ext became unresponsive. I think it must be a hardware issue with my specific 300M16-ext.