Winchill timeout in internal browser?

All -

I have a user who reports that after using a Creo (2.0, M110) session for a while (the amount of time varies), his internal Windchill session (mozilla-based browser) will stop working, and the browser window goes blank/white.  Is there some weird config setting for Windchill timeout that he may need or that he has and needs to get rid of?  Or does this sound like a machine/network problem (in which case, this is getting chucked over to I.T.....)

Thanks in advance -

Chrystal Johnstone

Seattle, WA