Yum update crashing my OpenVPN tunnels

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I have 100's of CentOS 5.10 clients that I access through a OpenVPN connection. I have internal repo that they use for updates.

However some of my clients have some serious issues pulling packages from the internal repo.

I have time out issues on some clients while running "yum repolist", also I have tried to run "yum -y update" on a few of these clients and watched the OpenVPN tunnels just fall apart, only to re-establish a connection later. If some how I can get the update processed started, many of the packages don't pass the

What could be going on here? Is yum being greedy with bandwidth?

I'm seeing things like this a lot...

 http://yum1.lighthouse.sec/repos/centos/5/os/x86_64/CentOS/perl-5.8.8-41.el5.x86_64.rpm: [Errno -1] Package does not match intended download 

This isn't an issue for other clients