Hum. Connection and reconnection would send more frames, but I would not think that many. There are three types of frames used on 802.11 networks, management, control, and data. On connection an access point says yes I see you, but are you authorized? You send the authorization info and it opens a port to pass the traffic onto the wired network. Even if someone or ones had an access point nearby or variations in signal strength was causing your NIC to jump from access point to access point I would not think it would generate that much more traffic.
Fire up a network analyzer, capture some frames, and we will look at them to see what we can see.
