hi mate.. ive never used this facility.. i do though change my channel to Nova Sports 2 before i turn my box into standby.. then when i turn it back on via remote it stays on Nova Sports 2..
Even on the rare occasions when i reboot my box it defaults back to Nova Sports 2.. It did use to default back to Premieire Sports Portal but i haven't watched that for a long time so it may default back to the most watched channel...
Do you regularly mains power off your box..??
It doesn't work its 'magic' when its powered off but it does when in standby