We are having trouble with our systems. We have Datalogger 3 installed on Windows 7 Pro computer via RS-232 (USB to RS-232) with a 34970A datalogger. We can run the software easily scanning at 1 scan per second, however we notice over time (5 hours) our data is no longer live. Another words we are experiencing what seems like lag/delay and after a period of time the software time is behind by hours. If we try scanning on anything faster than 1 scan per second, we crash the software and we can only exit out by using task manager force close. All of our PC's have minimum of 2gb ram and a I5 processor.