"No Internet access" message when connected to WiFi

[laikei]

hi there
i just bought the sony xz a week ago. and i have below issues.
1. Date and time error: after restart my phone, i would received whatsapp error message about my phone's setting is out of range. altho i am using auto time by network provider, it still reset as 1970...8 ish pm. and takes a few mins to back to normal date and time.
2. wifi connected but no internet access warning message: infact the wifi has no issue....still can connecting to internet. however every time connected to wifi..still have that message "connected, no internet access" from wifi connection menu.
3.unstable mobile data: it will be drop out....and i have to switch off and on again from data setting.
4. the battery is gone faster than normal (samsung) phone. half day used 40%. i just leave the phone on my desk with wifin data connected

could you please help or any user having the same issue?

thanks

[TimTheToolMan]

I could only get my Xperia to connect to the internet by setting up a static IP address for the phone in my router, and then entering that static IP address into the phone setting.   That works well, problem solved.  If your router is setup for DHCP, it will assign an unused  IP address when connecting.  If your phone is setup to a set static address, I don't see how that will work unless you just happen to set the static addr to what the router assigns.