it's my understanding that you have a web page that refreshes its content on timer in js. If you got the initial page with debugger, it may trigger debugger on each refresh. This happens because debugger sets DBGSESSID cookie on the 1st run. All subsequent refreshes in the browser will send this cookie back to the server and will trigger the debugger. To avoid it you have to uncheck "debug session" option or issue DBGSESSID with c=0 flag -- see
http://www.nusphere.com/kb/technicalfaq/faq_dbg_related.htm for further details