Error message 775 and also 771 - DirecTV

I keep getting 775 and/or 771. All cables tight. Reset Swim by unplugging for 15 seconds
No obstructions in front of dish. Finally turn tv and box off for 1 hour. Then turn back on, unplug Swim. Replug. Usually tv works again. Do I need to have service call? Other ideas. Appreciate help. Rbhodg

This question, "Error message 775 and also 771," is about DirecTV channels, programming, equipment, and sports.

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