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Sadly 11.7(1) hasn't fixed the problem, it does indeed appear to be a memory leak, the phones have to be in use for 2 or more weeks (without reboot) before the freezing starts intermittently manifesting itself.
It would appear that despite being out ...
We've been evaluating 11.7(1) on 24x 8865 for a couple of weeks, so far so good, but given that the freezing is intermittent we're not signing off on it yet.