I have the 55X810C and I've noticed that the tv will sometimes come up in Android TV home screen (which I never used). I'll then have to switch back to the input I use.

Check it, Nougat is out. Installing it now: https://esupport.sony.com/US/p/swu-download.pl?mdl=XBR65X810C&upd_id=11397&os_group_id=18

It installed successfully. I was experiencing this same issue and the nougat update fixed it. I think you are getting it confused with another update, which came out several weeks ago. It sounds like you did an OTA update and the message for his update says it isn't being pushed out via OTA until AFTER 01/2018.

https://drive.google.com/file/d/1kpD3Uo1QP5TxmuDQ9aEUyC15SNz2p9fh/view?usp=drivesdk