I have 2 ASA 5520's in active standby mode, they are on IOS 8.2(2) and have 512mb of memory.
For some reason the memory usage went from 70% to 85% at 4pm yesterday. When I look back at the the changes at that time all I did was add a subnet to a rule. I took the subnet back out of the rule today and the memory has remained the same.
Any ideas on when I can do please let me know.