Apple investigating reports of frozen iPad Pro slates, with a screen that turns black after charging

Both 32GB and 128GB models are affected, covering both Wi-Fi and Wi-Fi + Cellular versions of the tablet running on iOS 9.1. Apple just launched the 12.9-inch iPad on November 11th, after unveiling the tablet back in September. Available in Silver, Gold or Space Gray, the 32GB Wi-Fi only model is $799 while the 128GB version is priced at $949. The Wi-Fi + Cellular Apple iPad Pro comes with 128GB of internal storage, and is priced at $1079. Apple is offering the stylus-like Pencil for $99, and the Smart Keyboard for $169.
Apple is trying to find out what causes some iPad Pro units to become unresponsive when being charged
source: Apple via MacRumors