tv 50S425 randomly fails to connect after TV has been powered off for several hours. Have reset network, done a system power system restart, then power off /on
Found an AUTO POWER SETTING today that was checked "Turn power off after 4 hours". TCL Tech and I have turned the option OFF and will monitor to see if this eliminates the problem.
If it does, the conclusion will be that version 10.5 had a programming change in the area of reconnecting in the area of the stored WIFI passcode and will need to be addressed by the developers.