Freeswitch and Sangoma 101D

Have an existing Freeswitch application running on Cent OS 5 with a Sangoma 101D card. Experiencing voice delays in both directions as call goes longer. Person who configured original machines is no longer available. Need someone to fix this issue and to configure a second backup machine. Sangona card issue. Looking for individual with direct experience in debugging issue with these specific components. You will only deal with the Sangoma card issue on one machine, and the configuration of wanpipe on backup machine.