T46 Phone SLOW/HANG issues

[shansted]

In the last 3 weeks I've had our Reception phones, All T46G's with 2 EXP40's, Become Very Slow. Calling out takes over 10 seconds, calls coming in takes a long time to ring, and update the screen. I have logged onto the web interface while this is happening, and it was very slow, and Account 1 was listed as disabled.
They are all on the latest firmware, and they have the issue Simultaneously.

Rebooting the phone fixes the issue.

This only started happening after I upgraded the firmware. Before that I'd never had a phone hang.

We have T22's and T28's which have never given an issue.

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Any chance this is Autoprovision Related?? That would explain the phones having issues at the same time??

Has Anyone seen this behaviour??