Have you tried rebooting it from the menu@192.168.0.1 ?
I am on my third unit in 12 months , the quality and reliability of these units is very disappointing compared to my old Netgear unit which hasnt missed a beat but doesnt have voip.
You could also try a factory reset by pushing something pointy in the hole in thr back for 10 seconds or so , but remember you will have to re add your isp details and password.
Ironically , I also have one line that keeps going down at the moment Luckily , I was able to fix my second unit as Netgear didnt want it back so I might put that one back on.
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