i'm pretty sure you probably have a dp quad. chances are it's bad. another test you can run is menu, option 6, option 1, option 3(system info test). wait till the test is done and check "details" to see if your lnb has "drifted". either way it goes if 3 of your 4 boxes are going out it is your lnb. you might to call dish to setup a service call. depending on how long it's been since a tech went out to your house last, you might have to pay for the service call. one other thing you should look at is the color of the barrels on the wall plate and make sure that they are blue(good indicator that it is high frequency). good luck.