I haven't seen you in my logs since 19-Aug. I keep my rig on 24x365.
I know there's a problem with timing issues with the flex series. Normally a restart of the computer or just the Flex software solves it.
It's all about DPC latency. I have a friend with a Flex 3000 who was having this problem but hasn't completely solved it yet. He just restarts the software when he's working anything that requires accurate timing like JT modes.