Official reply from Astro:
As part of its best business practice, Astro continuously reviews its content proposition to offer the best choices and a variety of compelling content for our customers. In line with this, any channel that is unable to fulfill these objectives will be reviewed. To this end, we regret to inform that effective from June 30, 2016 at 23:59 hours, the Sundance channel (Channel 438) will cease transmission. We apologize for any inconvenience caused.