Is this a recent install? Did you already do the 100 to 10 switch? (That is the single thing that kept me from getting up & running when I first had mine.)
If I don't reboot my whole network setup, My DI-524 will literally stay up for a month (maybe more?) at a time. I have everything setup as default w/ 128bit wep & that's it. (After the 100/10 switch mentioned above, of course).