Dear D-Link, I am a Verizon DSL customer. Last October I ordered a new modem to replace a 9 year old unit. Verizon sent me a D-Link unit. Unfortunately I did not record its exact model/serial, but it was visually and functionally identical to the DSL-2750B. That new unit was having the problem that every 2 or 3 days the internet would stop working, but there would be absolutely no indication on the D-Link that anything was wrong. All lights were green, either solid or flashing as appropriate. I would clear the problem by cycling the power.
By last week the crashes were occurring every day or two. I called Verizon HSI which checked the line. They could find no Verizon line problem. They agreed that the modem was at fault and sent a new unit, the DSL-2750B s/n:PX2M1EB028856. Within 48 hours of power-up I'm having exactly the same problem: internet stops (both wi_fi & ethernet) but all front panel lights are green and normal.
My setup is the D-Link with a Dell pc running Windows (the crashes can occur whether the pc is on or off), an hp 8600 Plus printer (ditto the power), an OOMA voip unit (running 24/7), and a LifeShield internet based security system (ditto 24/7) on the ethernet ports. The modem also supports a mixed bag of Kindles, laptops and androids on wi-fi. There is also a Netgear range extender logged onto the modem.
I'm not asking for tech support or troubleshooting. I'm just bringing to your attention that the internet can stop on this unit without any visual indication that anything is wrong. This was also posted on 'dslreports.com'. Thank you.