All seems fine, but then..

[CSNLinux]

I've been running up and down the Networks posts, but couldn't find what I'm looking for.

After starting my device, wired and wireless connection look great.
Wired connection disconnects after a few minutes and when I remove and attach the cable, all works fine for some time.

Wireless looks good until I open my browser or any other connection needing program. It disconnects and I can't connect until I reboot.

I want to solve this. I know I can, but I need some help with it