After being the 3rd person to replace a guy's 622 receiver(back when we still carried them in our warehouse) I figured it had to be something with his electrical wiring, possibly the ground. So what I did, was skipped the surge protector, and plugged the receiver directly into the wall with a cheater(3 to 2 prong adapter) so the ground wasn't connected at all. Nobody's been back there since. A couple other guys used this same trick with the same positive result.
Why it works, I don't know........
If you have a tech come back out, talk him into giving you a 722, these are less sensitive than the 622, to faulty electrical wiring.
When you use a device with a three prong plug like a computer or digital receiver (these both are/contain digital signal processors), they are designed to use the complete circuit. The ground connection will do one of two things:
1. If the electrical system and ground is correctly installed, the ground drains excess unwanted electrical energy. Unwanted electrical energy in digital signal processing is called noise. Noise is the enemy of signal. A properly installed ground circuit reduces noise and thereby increases signal quality. In the "high-noise and signal-poor" world of HD satellite systems, more than ever, the ground is more than just the law.
2. If the ground is incorrectly installed, a ground loop antenna is formed which does not drain excess noise, but actually collects and adds more noise. It is a loop antenna. The ground loop antenna that is formed continually feeds an even greater amount of "noise" into the system. This noise builds up eroding the signal to noise ratio (signal quality) to the point of signal loss, and the need to reboot.
So, removing the ground prong in an improperly wired system stops the insertion of the excess added noise into the system, and allows it to "appear" to work fine. (It actually just takes MUCH longer for the system to require a re-boot.)
BUT,
When you remove the ground prong, you set up your system for future failure.
You have reduced the accuracy and function of the digital system.
You have also opened the door to potentially life threatening electrical shock and greatly increased the chance of irreversible equipment failure due to electrical fluctuations.
You will have reduced signal quality. Whether or not a reduction of signal quality is perceptible, depends on where you are on the signal meter. Reduced signal quality at this level won't likely affect your standard definition viewing because you are likely in the higher end of the signal with sats 110 and 119. But, if you are at the low end of the meter (which is just about all that is available in regards to HD), you may have increased incidence of pixilation, increased signal loss in poor weather, and may even experience sub-standard HDTV picture.