[SOLVED] TECHNICAL ISSUE OCCURED POSSIBLY DUE TO BAD NETWORK CONNECTION

Hi, i have this issue since yesterday. I saw topics about it, but i cant' solve the problem.
Every time i click on an activity i have this popup which says "TECHNICAL ISSUE OCCURED POSSIBLY DUE TO BAD NETWORK CONNECTION".
www.projeqtor.org/en/forum/2-submit-issu...nection?limitstart=0

I can't edit php.ini, i have nothing on apache log, or in projeqtor log...
I attach you a file of my browser console...
NOTE : my browser is Opera, i have no issue with firefox or edge...

Thanks in advance

Ok i found the problem... i use a user agent switcher for my devs. if i disable it, everything is fine!