I am running gnu screen version 4.00.02.
Everyone once in a while (but consistently) a terminal will freeze up while printing output and there is no way that I know of to unfreeze it.
CTL A q does not help and I tried about every command available in the help.
I can create other terminals within the screen, but cannot usually reconnect to the screen session it if I detach it. The frozen terminal remains just that (frozen) until I terminate the entire screen session.
I also tried the "wipe" function of the screen command, though I have not seen a need for it.