I contacted dlink about two weeks ago and got belligerent with them in regards to me having to constantly reboot my router 1-2 times per week, because it was becoming unresponsive. I suppose my router was having the same issues as hundreds of other users here in the forum, so the dlink rep sent me firmware 1.33NA. I loaded it 13 days ago now, and haven't had a single issue since.
I'm not sure if this firmware is available in the beta section, if it is, I wanted everyone to know that it has worked for me thus far. If anything changes I will post it here.....