Reciever always reboots on 91

[abby]

Im running a DPPLUS lnb and another dish with a singal dp lnb,the dpplus lnb works great ,i tryed to hook the singal dp lnb to it for the other sat singal but it would not work,it would not switch over to that sat,so i ran a cable from the dpplus lnb to a sw21 switch port1 and the singal dish to port 2.the singal dish after watching it for 1 min the reciever will reboot the say no singal also in my antenna setting it wont save the settings for the singal dish.

any ideas?