EPM Downloading Updater Freeze

I have had an issue on a few of my Polycom IP 450 phones. They start provisioning with the EPM and they get to the part where it says downloading new updater and goes about 25% of the way and freeze. I had two phones do it yesterday and I ended up swapping the phones with other IP 450’s and they worked. I then added a new extension and mapped it to the MAC of one of the old phones for testing and it worked perfectly. Any ideas?