Not sure if this is due to something on PS side or the Lite announcement (more people holding out for that), but either way congrats Sony for at least one more time on top until ps5!
Definitely the Switch Lite/Upgraded Battery Switch models holding Switch sales back. In fact, for a console with 2 new versions incoming, one of them replacing the current model and the other being $100 cheaper, Switch is still selling extremely well.
And congrats for reaching 4000 posts!
The Nintendo eShop rating Thread: http://gamrconnect.vgchartz.com/thread.php?id=237454