Errors in all the workflow tools and the print tool,

Errors in all the workflow tools and the print tool,

From time to time, we get errors in all the workflow tools and the print tool at the Geocortex (Attached an example), and the solution for this error is restarting the World Wide Web Publishing Service (wwps) (attached) but not playing with the wotkflows themselves!

/customer/servlet/servlet.FileDownload?file=00P6000000eluC6EAI

/customer/servlet/servlet.FileDownload?file=00P6000000eltmgEAA

then why all this story is happening from time to time? why the solution is in restarting the wwps?

Best,

Majdoleen