Well, it sounds like you don't want to monkey much. (Otherwise I'd recommend rooting and then installing vanilla 2.2, which is going to be the most stable of any release). It sounds like the problem you experienced is just a flat out bug and might not have anything to do with any apps you are running.
On the other hand, are you using any task-killing apps, or battery saving apps or anything that might be screwing around with system processes? If you are, I would recommend getting rid of them -- they are generally cause more problems in the long-run than they solve. If not, then I'm not sure what to tell you other than file a bug report or call Verizon and complain, but neither of these options will fix your problem.
If the problem was at root a signal issue, there is a way to update cell tower information, which Verizon can help you with. It involves dialing a number and allowing an automatic update.
BUT, if you did want to monkey a bit, then I do suggest flashing the vanilla froyo. It is just a little intensive, but wouldn't take you longer than an hour. If you want information in this regard, I can provide you with a website that includes step by step instructions.