Well, there is a lot of bad copper in Tampa. It's not uncommon to see a cable get 500-1000 feet longer when it rains.

With the D-Channel flapping like that it would explain all the dropped calls as well.

Looks like you've got a bunch of deadlocks too (All the queue messages). It's not related to your dropping calls but I figured I'd mention it as well.

I've got a guy who is doing some work for us that has a bit of experience with SwitchVox. You can try giving him at call at 863-393-9336. His name is Kevin.