network-manager auto-connect to the wrong wifi network

I added a second access-point to my office, but I want that my ubuntu pc still connects to the old access point, so I disabled "auto connect" for the new access point. When I boot the pc network-manager still connects to the new access-point.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: network-manager 0.9.8.8-0ubuntu28
ProcVersionSignature: Ubuntu 3.16.0-29.39-generic 3.16.7-ckt2
Uname: Linux 3.16.0-29-generic x86_64
NonfreeKernelModules: nvidia wl
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CurrentDesktop: GNOME
Date: Fri Feb 20 12:31:22 2015
IfupdownConfig:
 auto lo
 iface lo inet loopback
IpRoute:
 default via 192.168.15.1 dev wlan1 proto static
 192.168.15.0/24 dev wlan1 proto kernel scope link src 192.168.15.107 metric 9
 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
SourcePackage: network-manager
UpgradeStatus: Upgraded to utopic on 2014-12-02 (79 days ago)
WpaSupplicantLog:

nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH
 wlan1 802-11-wireless connected /org/freedesktop/NetworkManager/Devices/2
 eth5 802-3-ethernet unavailable /org/freedesktop/NetworkManager/Devices/1
 eth4 802-3-ethernet unavailable /org/freedesktop/NetworkManager/Devices/0
nmcli-nm:
 RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE WIFI WWAN-HARDWARE WWAN
 running 0.9.8.8 connected enabled enabled enabled enabled disabled