Sorry for my English that is too low because I am French, I'll try anyway to explain my problem.
In fact I bought the DSL-2750U model to share internet from my 3G dongle.
When I plug the 3G USB port on the router, USB router LED lights and internet is shared, knowing that I have made any configuration on the router associated with the 3G dongle.
The problem : after some time of use the router ceases to share internet from 3G dongle and USB router LED on the modem goes off.
How can I solve this problem? For internet sharing from my 3G dongle through the router is not interrupted