LMS connection constantly freezing

I never had any problems until about a week ago. Coincidentally or not, this began happening after I "upgraded" to the latest version. The sympton is that I get a "problem connecting" message on my duet controller; no difference using the web page option. Furthermore, the only way to get it to reset is to force both the LMS server and the "tray icon" execution files to "end process" via Windows Task Manager; clicking the Stop button on the LMS control panel , or right clicking on the tray icon, does nothing.

I connect wirelessly on everything, and my OS is Vista.

Any ideas on what I can look for? This is driving me batty.

Thanks!