i have two boxes. both boxes are working fine. however, in one room, both boxes has no signal on echo 8.6(echo 7 and 3 working fine) and the other room has all echo working. can someone tell what is going on. both boxes have b-75 bin 269. i have tried to delete the echo 8.6 satelite and rescan using blind scan. i momentarily get signal for 5 minutes then back to no signal. i read somewhere not to use blind scan and use channel scan. i do not have channel scan anywhere on menu screen. this problem just started about 4 days ago. PLEASE HELP. THANKS