Hello,
My other router died last month (it was a D-Link DIR-600), he ran for 5 years, 24/7.. not having a single problem with him in all that time. RIP buddy

Happy with D-link, I went on and got a N300 DIR-605L. However, it has one problem: Whenever I try browsing or using the wifi while the desktop is downloading things, it says Unable to find server, connection unavailable, etc. The only exception I found to this is TeamSpeak, it keeps working even with download in progress.
I have the same internet connection as always: wired, fiber (modem for fiber cable >> utp out of modem >> router >> utp to desktop; and wifi around the house)
This happens when I install a game with it's launcher, or update a game, or download something from steam, or download a torrent.
For the duration of the download I have no internet access on wifi or desktop browsers.
If I connect the desktop directly to the internet there is no such problem.
I lived with it till now, but it's kind of anoying.. What to do while waiting for a download? ...Hmm, I know, browsing! ...Meh.
Settings are factory default, I only set up the internet connection with user and pass.
Is there a way for me to fix this? Thanks
uploading a photo of it's back also, in case it helps