If you are running into switches being unresponsive and kicking users out that you may be running into a memory leak issue or memory spiking due to some fault that is causing the switch to cause memory spike.
you can always run the “sh logging” command to see what is in the logs
if you see this error message “%AAA-3-ACCT_LOW_MEM_UID_FAIL: AAA unable to create UID for incoming calls due to insufficient processor memory” this means that “AAA” is causing some issue with memory spike
Few signs that memory is being spiked are listed below
This usually starts when memory has gone over 85 % – different outcome for different Cisco switch models – in this case the error was being caused by a dynamic access list which was not configured correctly and kept spiking the memory –
link for the bug and Cisco explanation and in our case this was due to switch configured for Radius authentication with every port configured for 802.1x authticaion with Cisco ISE
if you run into this type of error – I recommend that to call Cisco support to see what may be causing this in your case