I am on anything from 5 to 10 networks at any time
i have a freezing problem on disconnect mIRC (when internet connection drops / or brownout and the modem resets), mIRC stops responding entirely for a period of time from 1-10 seconds.
I found it even crashed one time when everything tried to disconnect when i had changed my LAN's ip addresses (as it had bound the main to the wrong main ip)
... altho im not sure if i reported in bugs i might have to have a look when i have a little more time up my sleeves.