Internet Down - Modem Will Not Connect

I have a Motorola Surfboard (SBG6580) that is approximately one year old. Up until the last six months, it has worked perfectly. It has recently started dropping connections, causing problems with not only my personal life but my schooling as well.

I've been unable to do anything online for three days and support hasn't been helpful.

As I'm typing this, using my phone's tethered connection, my modem is attempting to connect. Normally, it's as simple as a quick call to Cox and a reset of the modem and I'm on my way. After the first two times, this has not been the case. I've hard reset it, performed a "30-30-30" reset, and also restored the router to factory settings via the user interface. All to no avail.

I have noticed a few odd things in the logs though:

Cox has grown increasingly frustrating over the last year or so and customer support's only advice is "get a new router". I refuse to believe that an immobile device with no moving parts  just "dies". Especially with the problems I've had in the past with Cox.

Any assistance is greatly appreciated.