Nikon has released new firmware updates for the Nikon D810 and D810A cameras that fixed an issue when using the WR-R10 wireless remote controller.
The firmwares can be downloaded from:
For D810 – http://downloadcenter.nikonimglib.com/en/download/fw/180.html
For D810A – http://downloadcenter.nikonimglib.com/en/download/fw/181.html