[Freeswitch-users] Memory problems

I have been using Freeswitch (git updated regularly) for about 9 months on a very low load ubuntu server. I have noticed that the after a period of time (sometimes only a few days) I am unable to make calls from attached SIP phones. Logging into the server I find freeswitch is taking upto 70% of the memory (measured by top), and I can hear the disk being thrashed (swapping, I assume). Restarting Freeswitch fixes all the problems & it then uses only 5% of them memory. How can I collect more debuging information to help fix the problem?