I got mine on 23rd November and just about the first things I noticed were WiFi dropping every few second and a large number of software updates (to the OS, not apps). That whole experience was also worse because the dropping WiFi slowed down the downloading of the updates and caused many connection lost dialogue boxes.
As far as I can tell only the very last of these updates had any effect on the WiFi which now seems mostly reliable. It does drop very occasionally, particularly if I use the microwave oven, but as microwaves use the 2.4Ghz band that's handly surprising. I am hoping to receive a dual band router soon so it will be interesting to see how well that works.