Same problem here. Galaxy S8+ in UK with Virgin Superhub3 router. I constantly get the exclamation mark next to the wifi signal. Only fix is to go into airplane mode, wait a few seconds then turn airplane mode off again. Our household has around 10 mobile devices connected to wifi (none are Samsung apart from my phone) and all of them connect to the wifi/internet without any problems. It's getting really frustrating as I like the phone in every other respect.
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