1:Dont have any problem with That

2:if you use battery saver, it will automaticly turn on the sync. Just realise it yerterday after amdathlon ask me to double check battery saver mode

3:i just use default browsers. No problem.. Facebook also okay. Just instagram video load very slow. I use windows phone before and use 6tag. Very laju liao

4:just allow your keyboard to auto start in the permission manager. I also had a same problem. Someone suggest me to to that. And the problem gone.

Check on Security App-Permissions-Permision

and check the permissions for your specific app