dns settings for wifi's with open connections keep going back to manual

[Pun Ransi]

Whenever i try to go to a coffee shop or anywhere with open wifi connections the internet is always hard to connect to because the dns settings keep going back to manual even though I've tried to permanently make it auto. I end up connecting but it says connected but no internet. Then it's a process to change the settings and wait until it works. But when i connect to a wifi that is password encrypted everything works fine with no issues. Any advice on what to do about this inconvenience?

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