My current setup I run a Line 6 POD HD Pro via USB to my iMac 27' to Garageband. I notice that I can play my guitar and it will be fine for a while then out of nowhere it is like I hit a spike and it is out of sync and the latency shoots way up and is like that until I reset my POD. It recently started doing this and I haven't changed anything software or hardware wise. Anyone know what could be causing this issue?