oddly specific signal/picture issues - NICK channels on a 625 DVR

[halord]

Hi all, I am a new person here. I hope I am posting to the right area and appreciate any help you can provide.
I have a Dish Network system with a 625 model DVR. All is well until after dark each night when several channels (Nick, NickW, NickJr, and Spike) all get terribly distorted and unviewable. All other channels are fine -crystal clear perfect in fact.
I am in the Atlanta suburbs.
I have searched high and low and don't see anyone with the same issue. I figured if it was cables or the box other channels would be affected so it doesnt make sense. It is really weird because it only seems to be a problem when the sun is down.
Also, I have a 722 downstairs and the tvs on this box (both HD and not) do not have this issue at all.
Any suggestions appreciated!

thanks,
halord

 

[TheKrell]

This is most likely an external cable, connector or barrel issue in the line going to your 625. After dark, it is barely able to get a lock on the transponder in use for those channels. That's my guess.

 

[halord]

Thanks!
I understand cable & connector - whats a barrel?
I was thinking of getting a high quality co-ax cable to by pass how it is currently wired from the dish right to the 625 to see if thats the issue.
I appreciate the response. It is such a weird problem... all other channels are fine all the time and these are only bad at night.
THANK YOU

 

[TheKrell]

Good plan on bypassing the current cable with a test RG6 cable. A barrel is the connector that goes between two separate lengths of coax. There might be no such barrel in your installation other than the grounding block barrels themselves.