500 Internal Server Error

Hi,

We are experiencing an intermittent 500 internal server error it comes every after 45 hours so we need to restart the server just to bring the site back and it will come again after 45 hours

Here are some of the Failed Request log

<?xml version="1.0" encoding="UTF-8" ?>
<?xml-stylesheet type='text/xsl' href='freb.xsl'?>
<!-- saved from url=(0014)about:internet -->
<failedRequest url=" mywebsite.com:80/modules/mod_maximenuck/...k.php?monid=top-main "
siteId="1"
appPoolId="DefaultAppPool"
processId="3552"
verb="GET"
remoteUserName=""
userName=""
tokenUserName="NT AUTHORITY\IUSR"
authenticationType="anonymous"
activityId="{00000000-0000-0000-D616-008000000089}"
failureReason="STATUS_CODE"
statusCode="500"
triggerStatusCode="500"
timeTaken="900001"
xmlns:freb=" schemas.microsoft.com/win/2006/06/iis/freb "
>
<Event xmlns=" schemas.microsoft.com/win/2004/08/events/event ">
<System>
<Provider Name="WWW Server" Guid="{3A2A4E84-4C21-4981-AE10-3FDA0D9B0F83}"/>
<EventID>0</EventID>
<Version>1</Version>
<Level>5</Level>
<Opcode>2</Opcode>
<Keywords>0x100</Keywords>
<TimeCreated SystemTime="2014-02-06T03:45:01.628Z"/>
<Correlation ActivityID="{00000000-0000-0000-D616-008000000089}"/>
<Execution ProcessID="3552" ThreadID="4456"/>
<Computer>HCTSRVWEB01</Computer>
</System>

Hi
do you have access to this file ? :
/modules/mod_maximenuck/themes/css3megamenu/css/maximenuhck.php

this is just some CSS styles and should not return an error 500 on your server.
CEd

yes, i can access that file through the web browser

that's strange !
can it be due to a security rule on your server ? I don't see any other explanation...

I am using IIS8 on Windows server 2012. The error comes in cycle of 45 hours and today is past till 65 hours.

the only thing I can suggest it that :
1/ edit this file in your browser
mywebsite.com/modules/mod_maximenuck/the...k.php?monid=top-main

2/ copy all the css styles from this page
3/ paste them into a css file of your website (from your template for example)
4/ edit the maximenu module and set "use the styles of the theme" to NO

Then see if it occurs again