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Yo,turns out there are later firmware versions on the FTP site. The latest is 1.70:ftp://ftp.d-link.co.za/dsl2750u%20(Retail)/Firmware/Retail%20Version/Hardware%20Version%20T/T1/DSL-2750U_Firmware_AF_1.70_R01_LATEST/I just installed that now.Will see how it goes.
Same problem here. Two month old DSL-2750u. Works fine for a while then the WIFI turns off. Using Wifi analyzer on my android phone I can see the my network and the neighbouring networks and then mine just disappears from the screen while the others remain there. I Will also upgrade the firmware once no one else on the LAN is busy.