I have a problem on my thinkpad t440p with ubuntu 16.04 LTS. At home, I have two networks:
- one default network
- the extended version of my default network.
When I switch connections (for example from the default to the extended one) the network manager keeps asking for a password. When I fill it in (with remember this password for all users checked), the network manager creates a new configuration (and does this every time when I reconnect to a network). So I think the network manager thinks I am connecting to a new network when in reality I am connecting to the same one. He then proceeds to create a new configuration for the 'new' network. I never had this problem before and I never changed my router configuration.
EDIT: I can change my network without the network manager asking for a password or adding a new network profile by changing it through the settings (network section).