Roku TV is forgetting network every time it is off

I just bought a Hisense Roku TV for a disabled person, and it connected to the wifi no problem.  However, the next time I turned the TV on, I needed to select the wifi and reenter the password.  And the same the next time.  All of my other roku devices simply reconnect the next time I use it, even if the network had been down or whatever.  Because the disabled person is unable to handle this sort of problem on their own, the TV is therefor useless.  What's up?  Solution?