Share your experience!
So my phone is only a few months old. A few weeks ago the auto-rotate stopped working for a while, but it fixed itself so I ignored the issue.
However, it's back. This time, it's been like this for 3 days and the problem isn't getting fixed. I've tried:
Turning Auto-Rotate on/off
Hard resetting the phone (volume key + power button)
Factory Resetting the phone
Restarting the phone with auto-rotate on/off
To no avail. Now:
Don't tell me to download a third party app, I refuse. There were no updates involved before the issue started. The gyro sensor works - when I use the camera the controls rotate as needed - the problem only exists in things like WhatsApp (or anywhere I have to use the keyboard), the Album, etc. It is a huge issue for me as I use my phone a lot for photo viewing and texting, and the keyboard is too small for me to use in Portrait mode.
Please, any help? Sending the phone in to my service provider is a mess as they don't give loan phones and sometimes they keep the thing for up to 6 weeks. Anything else I can try? I'm starting to become incredibly disappointed in Sony. If this problem extends to my Xperia Tablet Z as well I'll be very, very disappointed indeed!
Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
I would suggest that you try to boot your phone into safe mode to see if the problem may be related to any 3rd party app that you have installed in your phone:
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
You can also try to calibrate the accelerometer and gyroscope if you open the dialer > *#*#7378423#*#* > calibrations.
Hi,
First off, thanks for the reply. Appreciate it! Then, I ran the calibration stuffs and everything is working fine.
Booting into Safe Mode did fix the problem while in Safe Mode. I don't know what happened or why, but I just rebooted back into normal mode and everything is fixed. So yeah. You're the best, if you were here with me in South Africa I'd buy you a beer. Or a lion. Maybe a giraffe.
I kid. Thank for you help man, I appreciate it! 
Glad to hear that it solved your problem! 
Yeah so guess who's back? The problem was gone for a while, but it's back - this time intermittently. Sometimes the phone rotates, other times it refuses. It's annoying as **bleep**. Is there not some way to fix this completely? Is this a software or hardware issue? It went gaga right after the big software update, I'm sorry to say... 
Hi,
Sorry to hear that. In that case i suggest that you try to reinstall/repair the phone software using PC Companion:
http://www.sonymobile.com/update
In PC Companion, press start on Support Zone > Start on Update the phone/tablet software > Press the blue link that says "Repair phone/tablet".
Before repairing the software in your device you may want to backup your information first. Check out this topic for more information on how to:
http://talk.sonymobile.com/t5/FAQ/Backup-amp-Transfer/m-p/407253#U407253
That's exactly where I am as well.
Haven't changed my software load but the 4.4.4 update stopped auto-rotate 
I had the same issue, it could act up a second, a hundred times a day. Then it stopped working a whole day. Now it's fine. Very random and confusing. It's not a calibration thing, it either works or it doesn't.