Ever since the Samsung Galaxy S6 update, I have had significant issues with my phone. Apps are not syncing and I receive "no internet connection" notifications frequently when I am on known WiFi networks and when my phone is using mobile data (with 4g indicated and full bars of service.) I have tried restarting my phone, turning off WiFi, and I cleared the partition cache as well as app caches. None have had any lasting impact on performance. This is becoming very frustrating.