I have a problem: I can't change my network SSID or the duration of my Guest Network UNLESS I make a password that has uppercase characters, lowercase characters, numbers AND special characters. Otherwise, it doesn't allow me to save any changes made. 

That's insane and I belive it must be a bug. It may very well be a good recommendation (even though there is a post on this website knolodgebase saying the oposite " https://community.tp-link.com/us/home/kb/detail/412692 "), but it shouldnt be a requirement!!!

Don't want to change the password and have to change it in every device connected to the network, just to change it's duration or any other setting.

Any thoughts?

Thanks in advance!