Today I learned that Nikon has released an upgrade to version 1.2 of the firmware for the Coolpix P900 camera. This is not a major upgrade; according to Nikon, it fixes a couple of bugs concerning the ways the optional ML-L3 infrared remote control operates. I never experienced any problems with that remote, but it is probably a good idea to download and install the upgrade, if only to keep your camera’s operating system up to date.
Here is a link to the page with download instructions and the file to be downloaded: http://downloadcenter.nikonimglib.com/en/download/fw/150.html. I installed the upgrade in just a few minutes, with no problems. Basically, you just have to download a file, copy it to a memory card that has been formatted in the P900, then turn on the camera with the card in it, go to the Firmware Version item on the Setup menu, and follow the instructions to complete the upgrade.