did you tried exporting through mine project file? does it has the same issue?
I don't think some extensions might cause any issue with the export. still try exporting with some other browser to see if there is any difference.
construct team does provide support if you have any issues, just make sure you know more than basics of construct, so I'll be easy for you to understand what they want you to do, instead of just sending emails back n forth when you get confused , because you can solve most of the problems if you go through the manual and understand the engine.
also as I saw your project file I didn't notice any specific thing which can cause such delay in loading time and the connection error. just try exporting in android cordova as "debug apk" instead of "signed apk" and do check the "hide status bar" if want to hide notification bar.
if this still doesn't work if you allow then I would like to take a look at the system with TeamViewer.