The page of curriculum regularly stop working (ERR_CONNECTION_RESET) and in that moment page with exercises freezing and make new blank after submitting. In the same time all other pages (welcome page, my settings, forum…) continue to reload successfully.
Chrome version 69.0.3497.100 (the last). uBlock is inactive.
I don’t have any other problems with internet connection with websites.
Please, help to solve this problem. This problem makes breaks in study often.