Curriculum learn part works unstable (connection timed out)


I have some difficulties from time to time while using “learn.freecodecamp”.
For instance:

  • I pass through several lessons
  • Suddenly, after completing one more lesson, this site returns, that connection is timed out
  • I refresh the page, but it still won’t work
  • After from 1 to 10 minutes site is accessible again

Additional information:

  1. The other pages works as expected
  2. It does not matter where, when or what I do. It may happens from the very start or after one hour of studying
  3. Ping shows stable 75ms

It looks like magic. How can I fix that undisirable effect?

Perhaps may be the there is a reason within saving process of the progress?