Wifi keeps saying incorrect password S21+

[Westside73]

I have an S21+ for months now if I leave my home wifi range and come back it says incorrect password, I click on the wifi and it then connects. Seems to be a Samsung thing as my daughter who has an S22 and the Mrs who also has an S22 also have the same problems.

Things I have tried.

Rebooted the Sky router. including changing the password.

Rebooted the phone - several times

Checked for phone updates - all correct.

Forgotten the network and re connected.

Cleared cache both from within the app and putting the phone in diagnostic mode.

Deleted any apps that potentially could cause the problem

Reset all network connections and set back to factory including bluetooth.

Turned off auto connect and tried it back on.

Tried switching to flight mode then back.

Data roaming is off

Followed about 10 online guides how to fix this problem - none of which work.

Apart from a hard full reset I have tried everything I can find on the web. I am reluctant to hard reset where I could lose all my images, phone contacts etc.

Anything else I can try?

[MI5 · Accepted solution]

@Westside73 

I can't think of anything else to try, sorry.

Maybe just wait for Samsung to roll out a fix, or bite the bullet and factory reset.

You can back up the phone fully to SmartSwitch first so you won't lose anything.