I have a Tab S2 SM-T813 also that is having similar issue. I can connect to my router other devices with no problem but the S2 randomly drops the wifi connection or throws an authentication error or "Connected, no internet" message. If i turn off the wifi for five seconds, then back on it will auto-connect and it might work fine for the rest of my use period, or it might immediately drop within a few seconds. I have the same problem no matter what wifi network i connect to, home, hotels, coffee shops, etc. I have another identical Tab S2 that has done this a few times, but not nearly as often as my main one. I've tried all suggestions i've been able to find including forgetting the network, soft resetting, etc. The only thing i haven't done is reload with i hate to do because of the pain of resinstalling several work apps and email accounts. Any suggestions?
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