How to disable WIFI scanning for a connection

Hello All,
I am using a SURF SOHO in my office with WAN internet access via Xfinity WIFI.
I have an Xfinity login which works just fine to the local "WEP/WPA2/personal " hotspot.
Problem is that sometimes the hotspot drops out and the SOHO starts scanning for another hotspot, which it usually tries to log into with no success. This just goes on until I manually ask it to connect to Xfinity again.
I have the Xfinity WPA/ hotspot in Priority 1 and nothing in Priority 2-3-4. Yet it will still get stuck trying to connect to “anything” it sees.
How do I prevent this? How can I make it just wait for the signal to come back?