AT&T came out and corrected some issues that were not correctly addressed when the lines were first installed. I need to monitor the lines very closely for the next couple of weeks, but it looks like this may be why the connections have been very unreliable.
UPDATE 07/15/2008:
It turns out that the Netopia routers were overheating, which caused them to constantly recycle. Each time a router recycles its temperature increases due to the levels of the signals. Elevating the routers 1 inch from their mounting surface has alleviated the issue by allowing suffient air flow underneath the units.
Netopia had stated that there needs to be at least a 1 foot gap betweens units to prevent an EMI issue, but that has proven to not be true. There is currently no gap between any of our units, and they continue to functioning perfectly as long as they are elevated 1 inch from the mounting surface. Netopia (Motorola) has declined to comment on the issue.
We are currently experiencing connection issues that AT&T is working on. Our connection to the Internet has been down about 95% of the time for the past 24 hours, but should be fully functional late Thursday, June 26, 2008.
Take it easy,
Bill