Nvidia informed customers of their Shield Tablet that they may want to send it back in as part of a voluntary recall due to an issue with the battery.
NVIDIA is recalling its SHIELD tablets sold between July 2014 and July 2015. NVIDIA has determined that the battery in these tablets can overheat and pose a fire hazard.

NVIDIA is asking customers to visit http://www.nvidia.com/support/tabletrecall for information on how to obtain a replacement device.

NVIDIA is also asking consumers to stop using the recalled tablet, except as needed to participate in the recall and back up data. Consumers will receive a replacement tablet after registering to participate in the recall.

The recall does not affect any other NVIDIA products.

You can find more information on the Nvidia forums.