Hi,
After performing OTA update to Android 9 Pie WiFi started to experience serios problems.
It connects to Wi-Fi routers like before, but keep constantly loosing connection. The indication in the status bar is like normal. However all apps requiring internet stop working.
In Twitter app, you can browse the tweets but when you want to update the screen you have 'Unable to get tweets at this time'
In Gmail app, you can browse emails in a folder but when you switch to other folder you will have 'Connection error, retry'
In eBay app, you may go into Bids area of the app and see your bids, but when you switch to a lot the app locks.
WiFi calling is not working.
This problem was reported many times this Summer, when Pie was available for beta download (Reddit and Google dev forums have a long list of reports). It was suggested that:
-disable\enable WiFi trick can work this out. (It cannot with XZ2c)
-disable IPv6 in router as the Pie tries to establish IPv6 connection (It is not a solution when you are not an admin of a router, but I checked on 3 networks and diffrent models by disabling IPv6- no use).
-disable WiFi discover in WiFi settings (it does not work).
-reset network settig (I did lost all my saved networks, but it did not help).
I contacted Sony Support and the only suggestions is that OTA update did not go well, so they want me to make update again via Xperia Companion. Meaning hours of backup and loosing information and settings of dozens of apps.
According to the reports (you can google "WiFi issues after Android Pie update") making factory reset is not a solution. I will try to restore the updated Android 9 via Xperia Companion.
But this is the serious issue equal to bricking a phone that quite new yet. (((((((
