Same problem SM-T510 ( Tab A). Only started when updated software to One UI 2.1. Now every time I restart tablet it connects to last used WiFi for a few seconds then shows "Connection without internet". Only way to overcome is to restart wifi or connect to another wifi. I have three available connections, two from BT Home hub 2.4 ghz and 5ghz plus a Homeplug extender.
Everything else works perfectly. GET THE PROBLEM FIXED SAMSUNG!
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