picture does a freeze and jump for serveral seconds. I have had this problem for 5 months. Have talked with dish tech 6 times. they have sent out a new receiver, adj dish alignment, regounded the system outside, rechecked signal strength & replaced LNBs. It happens on both receivers (1) 625 & (1) 622. It happens on all channels so it must be somewhere in the common hardware. The only parts they have not changed were the cables & the DPP44. Any ideas what the problem is?