My 4 ton earthlinked DX system has been freezing up upon the initial spring start up cooling season. This system is 4 years old, I'm located in southeastern Michigan. Every spring, when I change the system over to cooling mode, after 30 to 40 minutes of running, the lines inside the compressor box ice over heavily, and the system looses efficiency, basically stops the flow to the heat exchanger. I have to shut the system down for about 6 hours each time to let it defrost before I can start it back up. I have had the installer over every year, he has made adjustments to the system, but this seems to continue for at least the first 7 to 10 days of the initial cooling season. Has anyone else been experiencing similar issues? I will be contacting Earhlinked later today to discuss. This is very frustruating, and I do no know if this is causing damage to my compressor unit.

Sounds like extremely cold ground around your loops that would be typical at the end of winter. Is there any chance you have extremely dry soil or something that would make the loops marginal?
Yes letting a system run after icing up can harm the unit.
An easy test if you still have the soaker hose in place would be to run hot water through it before switching to cooling.

I'm on alot of clay.  Unfortunately I don't have my soker hoses anymore.

Thinking a bit about the fundamentals of vapor compression refrigeration cycle...At beginning of cooling season, the liquid refrigerant hitting the indoor coil is so chilly that it causes icing, which once started, spreads across the evaporator by virtue of blocked air flow...the ice "snowballs" across the evap.

This is a common problem in systems, primarily commercial, that operate in cooling mode even when outdoor temps are low. An example would be a computer server room - impractical to open windows during cold weather, so system is operated in cooling mode 365/24/7.

Low ambient controls are typically applied, often slowing or stopping condenser fan(s) to keep head pressure up. That's not practical in this case, but perhaps some sort of freeze stat could be applied, stopping compressor operation for 5-10 minutes whenever coil temperature dips into icing range. Hot gas bypass might be an option, though tricky to implement.

Spoke with  Earthlinked yesterday, thay stated that freezing up is not normal and has something to do with the CAV (cooling assist valve) adjustment?  Any thoughts?

already gave my thoughts. i'm thinkin you have dry clay and the swing from season to season needs some lag time.
did this happen last year? after a mild winter? If so then it might be mechanical. I'd have to dig out my books to see what a CAV is/does. I'm several years from school on these now.