css - Strange Issues with IIS and ASP.NET WebForms -

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currently debugging external companies web portal product support, every few hours each day site 'breaks' side menu stops functioning properly, did comparisons of html when site functional , when site broken.

when broken, html shows style sheets being applied 100s of times.

<link href="../../app_themes/outlookmenu.css" type="text/css" rel="stylesheet" />

i suspect why page gets broken, without access code @ dead end, has ever experienced this? suspect session related or somehow related asyncpostback timeout.

note: after iisreset normal again few hours.

edit: did notice in event viewer around time occurs warning 1309

with stack trace containing load of 

system.web.ui.control.loadrecursive() system.web.ui.control.loadrecursive() system.web.ui.control.loadrecursive() system.web.ui.control.loadrecursive() system.web.ui.control.loadrecursive()


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