Perhaps Cisco is just trying to force us to buy more memory:
ID: 79764
Feature-set: bgp
Title: Memory Leak in BGP Router process
Reported: 11.1(7) 11.2(2)
State: J
There appears to be a Memory Leak in BGP Router Process.
Notice the State. It is J - which stands for Junked - which means they
will not fix this since it isn't viewed as an important problem.
Hank