CCleaner ver 6.34.11482 freezes computer for 10-15 seconds after cleaning finishes

now, when i run ccleaner’s clean-process, when the screen goes dark, i get a ccleaner-error-message saying 503 service temporarily unavailable and i have to use “task manager” to force the ccleaner window to close.

i tried rebooting my computer but the problem persisted.

i am using the latest version of ccleaner, build 6.36.

here’s a screenshot of the ccleaner-error-message: