I just got the SB2 13.5 i7 8GB RAM 256GB SSD this week and experienced the intermittent pointer mouse freezes with a Logitech G403. This happened wired or wireless with the USB receiver. In some cases the pointer disappeared entirely.
I was able to resolve it by installing the GHub software from logitech and lowering the polling rate from 1000 (seemingly the default) to 500. I'm able to keep the performance at maximum while plugged in and tested by playing a match in Overwatch. Previously, it was unplayable due to the mouse freezing. This was done with the mouse on wireless. I need to do a more prolonged test.
This is my second attempt at buying a SB2. The first time one of the batteries wouldn't charge and I returned it. This time it's a mouse issue. I wonder if the SB2 is just too clever/complex for its own good. It's especially jarring when the basics have problems.