Verizon EVDO Issues

[Charles Wyble <charles () thewybles com>]

Been troubleshooting a very strange problem for a couple of weeks now.

I have a few hundred systems deployed throughout the United States 
utilizing EVDO connectivity with Verizon as a carrier. They are stationary.

Over the past few weeks clusters of them in SF and Lewisville TX and a 
few other areas have been failing intermittently. They are offline for 
several days, then online for a few days then go offline again. They are 
running Linux and PPPD.

Has anyone else seen anything like this? I realize that there are very 
few other organizations with a network footprint like ours (few hundred 
static EVDO cards). Other large users like FedEx and Amtrak aren't 
reporting any issues. Verizon wants to replace the cards, but that 
doesn't seem like a viable solution, as it's localized to a few areas 
and is intermittent.

Replies on or off list appreciated.