Thanks for all the replies. I've updated client's router firmware, which was very old. Now I've put MoH on for the whole day and see if it happens again. MoH was doing the same thing, i.e. going down and coming back up. When it went down, on the screen you could see message saying 'No IP', and when it came back up, same old IP was back.
Phone's firmware is the latest one, which is on their website, i.e. 1.1.1.14. I know there exists some latest but still beta version of a firmware, but I'll stick with this one. There is no pattern when it goes down, it may does it twice an hour or not do it for many hours. But I've noticed that Automatic Upgrade Option was set to 60 min, I've now set it for 1440 minutes. Does automatic upgrade means only firmware upgrade or config upgrade as well. Can I have config upgrade sooner than 1440 minutes on this phone?
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