2 days ago my connection to wireless network is disconnecting about every 10 minutes.
To return to work, I need to turn off the network manager and on again.
After 10 minutes, it disconnects again. 
Follow the log until the moment of unexpected disconnection.
2015-06-10T15:15:01.232449-03:00 linux-1c03 cron[17374]: pam_unix(crond:session): session opened for user root by (uid=0)
2015-06-10T15:15:01.242120-03:00 linux-1c03 systemd: pam_unix(systemd-user:session): session opened for user root by (uid=0)
2015-06-10T15:15:01.279303-03:00 linux-1c03 CRON[17374]: pam_unix(crond:session): session closed for user root
2015-06-10T15:15:01.291231-03:00 linux-1c03 systemd: pam_unix(systemd-user:session): session closed for user root
2015-06-10T15:19:18.058931-03:00 linux-1c03 dhclient[15645]: DHCPREQUEST on vboxnet0 to 192.168.56.100 port 67 (xid=0x35049f0c)
2015-06-10T15:19:18.059236-03:00 linux-1c03 dhclient[15645]: DHCPACK from 192.168.56.100 (xid=0x35049f0c)
2015-06-10T15:19:18.060838-03:00 linux-1c03 dhclient[15645]: bound to 192.168.56.101 -- renewal in 571 seconds.
2015-06-10T15:19:18.392712-03:00 linux-1c03 dbus[855]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service'
2015-06-10T15:19:18.392935-03:00 linux-1c03 dbus[855]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
2015-06-10T15:28:49.149645-03:00 linux-1c03 dhclient[15645]: DHCPREQUEST on vboxnet0 to 192.168.56.100 port 67 (xid=0x35049f0c)
2015-06-10T15:28:49.150184-03:00 linux-1c03 dhclient[15645]: DHCPACK from 192.168.56.100 (xid=0x35049f0c)
2015-06-10T15:28:49.152902-03:00 linux-1c03 dhclient[15645]: bound to 192.168.56.101 -- renewal in 536 seconds.
2015-06-10T15:28:49.155533-03:00 linux-1c03 dbus[855]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service'
2015-06-10T15:28:49.156330-03:00 linux-1c03 systemd[1]: Cannot add dependency job for unit cups.socket, ignoring: Unit cups.socket failed to load: No such file or directory.
2015-06-10T15:28:49.163243-03:00 linux-1c03 dbus[855]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
2015-06-10T15:30:01.284929-03:00 linux-1c03 cron[17470]: pam_unix(crond:session): session opened for user root by (uid=0)
2015-06-10T15:30:01.288720-03:00 linux-1c03 systemd[1]: Cannot add dependency job for unit cups.socket, ignoring: Unit cups.socket failed to load: No such file or directory.
2015-06-10T15:30:01.292221-03:00 linux-1c03 systemd: pam_unix(systemd-user:session): session opened for user root by (uid=0)
2015-06-10T15:30:01.321942-03:00 linux-1c03 CRON[17470]: pam_unix(crond:session): session closed for user root
2015-06-10T15:30:01.332685-03:00 linux-1c03 systemd: pam_unix(systemd-user:session): session closed for user root
2015-06-10T15:37:45.949100-03:00 linux-1c03 dhclient[15645]: DHCPREQUEST on vboxnet0 to 192.168.56.100 port 67 (xid=0x35049f0c)
2015-06-10T15:37:45.949676-03:00 linux-1c03 dhclient[15645]: DHCPACK from 192.168.56.100 (xid=0x35049f0c)
2015-06-10T15:37:45.978413-03:00 linux-1c03 dhclient[15645]: bound to 192.168.56.101 -- renewal in 549 seconds.
2015-06-10T15:37:45.979522-03:00 linux-1c03 dbus[855]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service'
2015-06-10T15:37:45.979723-03:00 linux-1c03 dbus[855]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
2015-06-10T15:44:20.759591-03:00 linux-1c03 sudo: sofuraz : TTY=pts/2 ; PWD=/home/sofuraz ; USER=root ; COMMAND=/usr/bin/vim .vimrc
2015-06-10T15:44:20.759992-03:00 linux-1c03 sudo: pam_unix(sudo:session): session opened for user root by sofuraz(uid=0)
2015-06-10T15:44:28.008100-03:00 linux-1c03 sudo: pam_unix(sudo:session): session closed for user root
2015-06-10T15:44:36.594005-03:00 linux-1c03 sudo: sofuraz : TTY=pts/2 ; PWD=/home/sofuraz ; USER=root ; COMMAND=/usr/bin/vim .vimrc
2015-06-10T15:44:36.594489-03:00 linux-1c03 sudo: pam_unix(sudo:session): session opened for user root by sofuraz(uid=0)
2015-06-10T15:44:41.659543-03:00 linux-1c03 sudo: pam_unix(sudo:session): session closed for user root
2015-06-10T15:45:01.329337-03:00 linux-1c03 cron[17545]: pam_unix(crond:session): session opened for user root by (uid=0)
2015-06-10T15:45:01.334693-03:00 linux-1c03 systemd[1]: Cannot add dependency job for unit cups.socket, ignoring: Unit cups.socket failed to load: No such file or directory.
2015-06-10T15:45:01.339216-03:00 linux-1c03 systemd: pam_unix(systemd-user:session): session opened for user root by (uid=0)
2015-06-10T15:45:01.369648-03:00 linux-1c03 CRON[17545]: pam_unix(crond:session): session closed for user root
2015-06-10T15:45:01.381200-03:00 linux-1c03 systemd: pam_unix(systemd-user:session): session closed for user root
2015-06-10T15:46:54.381042-03:00 linux-1c03 dhclient[15645]: DHCPREQUEST on vboxnet0 to 192.168.56.100 port 67 (xid=0x35049f0c)
2015-06-10T15:46:54.381570-03:00 linux-1c03 dhclient[15645]: DHCPACK from 192.168.56.100 (xid=0x35049f0c)
2015-06-10T15:46:54.384213-03:00 linux-1c03 dhclient[15645]: bound to 192.168.56.101 -- renewal in 466 seconds.
2015-06-10T15:46:54.386799-03:00 linux-1c03 dbus[855]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service'
2015-06-10T15:46:54.394821-03:00 linux-1c03 dbus[855]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Thanks in advance…