Welcome to the community and I'm sorry to hear you're experiencing problems with your HD channels.
I have located your account to run a couple of tests and I can see there are some signal issues so I would like to send one of the team out to take a look at this for you.
If you click on the purple envelope at the top right of the screen you will see a message waiting for you with further information.
Talk to you soon.
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Sorry to hear this was still ongoing, has there been any improvements since?
I may need to arrange for someone else to take a look at this for you if you're still experiencing a poor picture so please let me know if there''s any problems.