Kept getting it using my laptop USB to serial. Here's how I fixed it:
Control panel - System - Hardware - Device Manager: expand Ports:right click on USB Serial Port, click Properties. Select Port Settings tab, click Advanced. Under BM Options, lower Latency Timer value. Mine was 16, I lowered it to 12, no problems now. I up'ed it 16 again, and BS2 acted up again. Set it back to 12 and works fine. I can use my laptop with my robot now !!!