Over time changes were made to the way that the channel is broadcast or received. Following the launch of BBC One HD on 3 November 2010, both the new channel and BBC HD were statistically multiplexed on the satellite feeds. Equally, on 6 June 2011, the satellite transponder carrying BBC One HD and BBC HD was upgraded to DVB-S2. In addition to the satellite changes, alterations were made in March 2011 for the Freeview HD encoders to change automatically between 1080i at 50 fields per second to 1080p at 25 frames per second depending on the programme's GOP. Unfortunately some receivers did not handle the transitions between these modes well, resulting in sound and picture disruption.