D1500 issues

[Noodle_DMX]

Hello,
Yesterday i bought a new Netgear D1500 wifi router for my adsl connection.
I've had some issues with the product but i'm not sure if it is the router itself or my ISP.
When i'm downloading something from the net (like a file in chrome or some program's update) im not able to surf the web. I've to do one thing at the time.
Also, sometimes it randomly goes offline ultil i restart it.

I've the latest firmware installed.
The other day with my old router (Which died underwater) everything worked perfectly.

Here it is an error from chrome: ERR_NETWORK_CHANGED

Thank you!! 

P.S. : It's brand new so I can change it if necessary. 

[DarrenM]

Hello Noodle_DMX

Have you tried to adjust the MTU on the modem. Here is a article covering how to change the MTU value

http://kb.netgear.com/app/answers/detail/a_id/24015?cid=wmt_netgear_organic

DarrenM

[Noodle_DMX]

The MTU was already set to my ISP's recommended number. 

Still, If my phone is downloading an update there's no way I can surf the web.