Yes, I understand that.The gounding block has everything to do with it when the wires from the dish aren't making a connection.
Anytime there is an odd even issue, its Voltage related.
LNB's, Multiswitch, faulty grounding blocks.
http://www.sadoun.com/Sat/Products/JVI/4-Way-Grounding-Block.JPG
It wasn't the LNB, and it wasn't the WB68, He changed the Grounding block and it was fixed.
Had the Ground block been in good shape the problem would not have been there.
That being said, the connection was the fault for your bad signal, all it is is a barrel to put the two wires together, so essentially it was a bad barrel.
My point was still valid, you can have a perfectly running set up without a ground block, you just talking your chances without one.
Remember the old saying that the more connection points the more of a chance for trouble .....
There you are ..... No I'm not saying to go without a Ground Block, just pointing out that it can provide another connection point.
In your case, it was the culprit.