WiFi Dropping after Upgrade

[SpamMagnet]

Since the Android upgrade my Z2 tablet drops its wifi connection almost every time I browse to a web page.  It stays down for about 30 secs then connects again.  Also, in the last couple of days I constantly get the message "Unfortunately email has stopped working".  This is as often as once every 10 seconds.  Obviously, this makes the device unusable.  This has only started happening since the upgrade.  All other wifi devices on the same access point are fine.  Signal strength is high.  The behaviour is just the same in safe mode and I have uninstalled everything that I can, leaving only all the junk that I am not allowed to uninstall by Sony/Google.

Can anyone tell me how to fix this or how to downgrade Android?  I will have to take the device back to the retailer otherwise.

Thanks.

[Uliwooly]

@SpamMagnet

any antivirus, battery apps, taskillers?

[SpamMagnet]

No apps installed whatsover.  I've uninstalled everything that I can, being left only with the Google/Sony junk.  Plus I've never knowingly installed any anti-virus, battery apps or task killers.

[Uliwooly]

@SpamMagnet

This is what I would do 

repair the tablet with PCC then boot on safe mode and test it again

[Uliwooly]

How to boot on safe mode

http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008

PCC

PC Companion (PCC)

Bridge (for Mac)

Alternatives on How to backup Xperias

http://talk.sonymobile.com/thread/36355

[SpamMagnet]

I'm already in safe mode.  What does PCC do?  How can I use it to fix the tablet?

Thanks.

[Uliwooly]

@SpamMagnet

run PCC > follow the steps to update the tablet > repair it

[SophiaW]

Hi SpamMagnet, welcome to the community!

To run a software repair on PC Companion:

1. Install and open PC Companion then select Support Zone.
2. Phone Software Update.
3. Start.
4. Repair Phone
5. Continue
6. Accept data removal
7. Next
8. Wait for prepare
9. Select Phone
10. Follow the connection steps

Keep us updated.

[SpamMagnet]

I have carried outthe repair procedure using PCC and connected WiFi.   I opened Google Chrome and as soon I browse to google search page I get "page not avalible off line" and the wifi icon on the top most status bar has disappeared.  In other words, exactly the same as before the repair.

This looks like either a hardware fault or an incompatibility between my acccess point and Android 5.  I have a Samsung smart phone running android 4 with no problems.and the tablet was fine when on android 4.  How do I get android 4 back?

Thanks

[Uliwooly]

@SpamMagnet

Have you tried other routers?