Intermittent : Couldn't find included component

To confirm, what you describe is:

• page1.cfm includes page2.cfm. 
• within page2.cfm, there is code of the form <cfinvoke component="componentName">.

If so, then the situation you describe can result in complications. To solve the problem, ensure the following:

• the values of the template attribute and component attribute in <cfinclude template="???"> and <cfinvoke component="???">, respectively, are both relative paths. In addition, ensure that each relative path starts from the web root. 
  For example, consider the following scenario in which page1.cfm includes page2.cfm. Within page2.cfm there is a cfinvoke for MyApp.cfc.
  {WEB_ROOT}/workspace/CFProject/testDir1/page1.cfm 
  {WEB_ROOT}/workspace/CFProject/testDir2/page2.cfm 
  {WEB_ROOT}/workspace/CFProject/cfc/MyApp.cfc 
  
  Then, using relative paths from the root, will result in:
  

  <!--- code in page1.cfm --->
  <!--- use relative path starting from root  --->
  <cfinclude template="/workspace/CFProject/testDir2/page2.cfm">​

  <!--- code in page2.cfm --->
  <!--- use relative path starting from root  --->
  <cfinvoke component="workspace.CFProject.cfc.MyApp">

• if access to a file is not 100% certain - for example, a file on a different machine, an uploaded file or a file locked by another process -  then apply fileExists() before any code that uses the file. 

Why bother with cfinclude of the cfc? It's early morning as I write, but I can't think of any reason it's necessary.

One makes an instance of a CFC available using any of such things as cfobject, createObject, cfinvoke, the new keyword, and so on. Those have both a means of naming the location for a CFC as well as an implicit search path.