It seems to be a lot people didnt want the show moved to Sundays, so now, we have to wait tell the end of Sept for the series to resume, that does not make any sense, why start a new series, air three/four episodes, and go on a hiatus, this the second year in a row History has done this.
I know all the episodes have been filmed, Adam was here in my city about the time of second episode, and was doing a interview, and that time said that they had one more episode to film.
I forgotten about that, they didnt do it for S4, it started with S2 , this break is shorter than the last one, S3, started 14th of Aug-25th Sept, then returned 12th-Feb