Do I understand you correctly in that you have t ried the troubleshooting mentioned in the thread already? In that case it would be best to have your device sent to an authorized service center in order to be examined by a technician. The easiest way to have your device sent in would be to get in touch with your Local support, and ask them to assist you. They will be well informed in regards to your local service routines.
Re: Some Keyboard buttons not working when the phone is vertical
I am expierenceing exactly the same issue since a couple of weeks, and it's really hard to text with this whole vertical line of non responding touchscreen. I would like to know if restoring the phone solved it (softwaer issue) or I just don't have another option than sending it to a local service.