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I have an Asrock AB350 mITX board with both wired and wiresless devices from Intel.
Both work and I have successfully connected to my home network and to the internet using each of those devices. But regardless of which one I use, I get constant hiccups in the network connection: suddenly the network becomes completely unresponsive for ~20 seconds until it comes back again. This happens quite often, once every 5-10 minutes.
My other server at home (which uses debian) or my laptop (OSX) have not had this problem ever. The problem is that I don't even know where to start looking for the solution.
I have flashed the bios with the latest version, but it does not seem to change anything.
Any suggestions? Thanks!
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go to the wiki and read how journalctl and dmesg work, and have a look what is recorded in the logs when this happens.
And use google. This m.board has problems, Windows users report BSOD related to network traffic. Flashing the Beta rom version seems to help
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Hi, thank you very much for your answer. 
I will try to de-cipher the info from dmesg.
As for the "use google" part... you can avoid that kind of comments.
Because I had used google before posting here, and they discourage people from trying to solve problems using these forums:
1) I had already upgraded to the latest version of the BIOS (which is more recent than the beta versions listed in the MOBO website). 
2) Unlike windows users I am getting the problem also when using a *wired* connection. So the problem seems to be something else.
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I got this:
UNIT FILE                                   STATE  
org.cups.cupsd.path                         enabled
autovt@.service                             enabled
avahi-daemon.service                        enabled
dbus-org.freedesktop.Avahi.service          enabled
dbus-org.freedesktop.ModemManager1.service  enabled
dbus-org.freedesktop.NetworkManager.service enabled
dbus-org.freedesktop.nm-dispatcher.service  enabled
display-manager.service                     enabled
getty@.service                              enabled
haveged.service                             enabled
iptables.service                            enabled
lightdm.service                             enabled
ModemManager.service                        enabled
NetworkManager-dispatcher.service           enabled
NetworkManager.service                      enabled
ntpd.service                                enabled
org.cups.cupsd.service                      enabled
sshd.service                                enabled
systemd-timesyncd.service                   enabled
ufw.service                                 enabled
avahi-daemon.socket                         enabled
org.cups.cupsd.socket                       enabled
sshd.socket                                 enabled
remote-fs.target                            enabled
pamac-cleancache.timer                      enabled
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