[Freeswitch-users] CPU Leak

Hello, Freeswitch CPU usage keeps increasing slowly every day. When I first restart freeswitch, I have about %90 cpu idle time at peak hour (~400 channels). The CPU idle decreases over time as freeswitch threads start using more cpu. After about 15 days, my CPU idle is at about %70 and I need to restart freeswitch to get it back to normal. Memory and number of FSW threads are all the same. Only that the threads use more CPU as time goes by. I'm using FreeSWITCH Version 1.4.15. Any suggestions? What should I look for? Is this a bug? Thanks, Ali Pey