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the first issue seems to be a hardware problem, contact your local Xperia care
http://support.sonymobile.com/global-en/contactUs/
The second issue, has been reported that some users are experiencing this and Sony is working to fix this
There is nothing I can do other than sending it to sony for the vibration feedback problem.
I just got the new update and I hoped it would solve the hotspot issue, but nothing. It is still not working. When I try to activate it, it says "Tethering error, Error occurred during tethering".
Any other tips?