Wireless issues on 16.04 with RTL8821AE, ASUS E202S

I've recently purchased an Asus E202S desktop computer and tried to install Ubuntu 16.04 on it. I had no problems to install or make a dualboot with Windows 10, but the real problems started to show up almost an hour after I've finished the system installation.

Basically, my wifi is periodically "freezing" (The wifi signal shows that everything is ok, but I do not have Internet connection), and I am forced to restart the network-manager. Even after restarting the manager, sometimes my wifi won't show up on the list of available networks or will not work at all. I don't have any of these problems on Windows 10, and also my Internet speed is much faster.

I've been trying to find the problem for almost one week, and here are some of the dozens of cases which seemed to be the closest to mine:

 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1482979 http://askubuntu.com/questions/730430/wifi-connection-keeps-dropping-in-ubuntu-15-10-rtl8821ae https://ubuntuforums.org/showthread.php?t=2245164 http://askubuntu.com/questions/797213/wireless-disconnect-issues-ubuntu-16-04-with-rtl8821ae http://askubuntu.com/questions/730430/wifi-connection-keeps-dropping-in-ubuntu-15-10-rtl8821ae

Even though I could find several people that had the same problem that I'm having, their solutions did not do me any good, and as a newbie ubuntu user, I'm not sure about how I should proceed in this situation.

Problem affects immediately if I uploading information like on Dropbox or via "scp" file transfer.When freezing, ping command answer:

 ping: sendmsg: No buffer space available

My wireless information:https://paste.ubuntu.com/23806837/

Also I've tried:

a.)

  sudo add-apt-repository ppa:hanipouspilot/rtlwifi  sudo apt-get update  sudo apt-get install rtlwifi-new-dkms

It makes connection a little bit stable, with this driver I can upload 30-40 mb instead of only 5mb, but after upload freezes again.

b.) If I boot with older kernel (3.19.8) networking is working perfect and two times faster. But!, only in shell because Xorg fail to start on this kernel with error:

 [   113.698] 003f:1bdf: 3F ILLEGAL EXTENDED X86 OPCODE! [   113.698] (II) VESA(0): Setting up VESA Mode 0x17F (1366x768) [   113.698] 0000:1fcf: 3F ILLEGAL EXTENDED X86 OPCODE! [   113.698] (II) VESA(0): VBESetVBEMode failed0000:1fcf: 3F ILLEGAL EXTENDED X86 OPCODE! [   113.698] [   113.698] (EE) Fatal server error: [   113.699] (EE) AddScreen/ScreenInit failed for driver 0 [   113.699] (EE)

Can anyone help me to solve these issues?