Lock table overflow

Hi friends

In one of my R/3 4.7 system, i m getting below messages

in SM21

GEG Lock table overflow

GEA Internal lock administration error

GZZ > EqSetCluster(); rtc=16 enxxmenq1806

The size of the lock table is 9000 KB. Can anyone help in telling me how to find what caused the lock table overflow ?

Lock system is working fine and also the updates are taking place