Problem On 119 loosing lock I have two units one 510 and one 301 on a dish 500 with the dual dish pro lnb. It seems like the biggest problem is with any channels on transponder 16 although have had simular problems on 14. These channels will not stay locked in on either receiver, but when I turn on the second unit channels lock in and stay locked. This is a consistent problem, if i turn off one of the units some times i loose the lock within a few seconds and at times stays on for several hours as soon as i turn on the second unit channel locks in and will stay locked as long as both receivers are on. Any help here would be appreciated . I suspect the lnb but would like to know if anyone has had this problem . Oh there are no external swithes.