Wifi version? Are you sure? Because as far as I know, 17.1.2.A.0.314 has not yet rolled out for the wifi version o.o
And have you, or anyone at your home, used the multi user function before the update? Or only started to use it after the update? Or not used multi user at all?
Having an extra user account active would take up extra RAM, no doubt.
But 995 MB of free RAM is still very decent though, it's still much more than most other tablets on the market.