SQL Memory Clerks - MEMORYCLERK_SQLCONNECTIONPOOL - Using all Memory

Hi All

Environment:

SQL 2008 R2 SP2

Server has 20GB of memory and 5GB allocated to SQL - Locked pages in memory is enabled

After some routine checks - I found a very low Page Life Expectancy

I check the memory clerks to check the highest consumers of memory

MEMORYCLERK_SQLCONNECTIONPOOL is the clerk using all most of the memory - 3.7GB

This is definately not normal - Can someone please advise as to how I can diagnose this? I've never seen this particular clerk using so much memory.

Thanks

Regards