Lumia 2520 WiFi connection problems - dhcp fails

I have problems connecting to my work wifi network, the tablet connects to the network but fails to get IP address with DHCP. It actually fails to find DHCP server. If I enter the IP settings manually - everything starts working.
Moreover, I have the same problems with my lumia 920 here, it fails to connect at all.
All other devices in our office including android, iphone, ipad and windows notebooks are connecting just fine.

fezzer79 wrote:
I am currently experiencing a serious wifi issue with my new Lumia 920. As i whole i think the phone is amazing, but this is taking the sheen off the experience.
From a fresh boot, my phone detects all wifi networks correctly, and i can use wifi without an issue. If i leave the phone unattended for a while, or move to a different wifi location, the phone then refuses to connect to the wifi , and even if i manually ask it to connect it tells me it can't. The only way i can fix this it to reboot the phone and it connects again no problem. I was hoping the new firmware update will fix this, but it looks like that wont appear until February
Any advice?
I have the same problem, and while I have no solution I have found that if you put it into Airplane Mode, turn the Wifi on then take it off Airplane mode you dont have to reboot.  It seems to happen only with my router at home when I am a fair way away from it (it goes through walls too).  My wife has a 920 and it doesnt happen to her at all!  Seems a obscure issue from my reading - do you have a first release 920 like I do?

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