7925G drops registration and reboots during call

We have 4 of these phones connecting to 2600i AP's on a WLC. They can sit idle for hours, but when you make a call, it will work, then at random, just drop off and reboot.  I also noticed that response times to all 4 phones will be good, around 30-40 ms then skyrocket after a while to upwards of 600 ms. I dont know if this is normal, and happens when the phone is idle, but I did notice when calling extension to extension between 2 phones response times were normal. 
When the call drops, ping stops responding.
I have done quite a few deployments, and can find nothing wrong on the WLC or callmanager, this is a first I have ever seen this.  Not sure if its a bug on the WLC, or the phone.

I also noticed that response times to all 4 phones will be good, around 30-40 ms then skyrocket after a while to upwards of 600 ms.
You will get high response time when there phone is on idle.  Good ping time happens when you are on a call.
They can sit idle for hours, but when you make a call, it will work, then at random, just drop off and reboot.
Make sure your phones are running firmwares version 1.4(3) and higher. 

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