I've had a look back through what's changed since we last did a successful cluster upgrade. The major thing is adding 'Bridge Role' and 'AP wired port profile' to some AP group profiles for AP-503h ethernet ports. I can see how this could prevent APs moving between mobility controllers and therefore stop the partitioning process although have not been able to test this in our lab as that's a single controller.
The good news, however, is when we've moved APs over to the cluster running 220.127.116.11 from 18.104.22.168 we've resolved a lot of little issues where we were having reports of things being slow, coverage not being great, performance on teams being poor and various other little annoyances. The remaining issues we have seem to be resolved with the latest windows drivers.
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