For several months I have noticed that some of my receivers, specifically a HR24-100 and a H21-200 receiver have been changing video settings to 480P when the receivers are set for 1080i and 1080p. Has anyone else experienced this change. Tech support has been useless in explaining why this happens, and their solution is to send a tech to my home to examine my system and suggest solutions. This will be the 3rd time that techs will be visiting me. Nothing seems to work. Just last night I noticed that the HR24-100 was defaulted back to 480p and the H21-100 changed itself to 720p from 1080p. Has anyone else experienced this and is there any solution to receivers changing resolution setting by themselves?