I've had the S10+ for a couple of days now and noticed WiFi dropping a few times. Toggling WiFi off then on again remedies it but I wondered if anyone else is experiencing this and if a fix had been discovered.
I have the same problems; only had it a day though
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!