too many problems with z1

[t_k]

Well to start off I'm a loyal Sony user. And I recently purchased the z1 after falling in love with it at first sight. Before this I had the arc s which I'd bought as soon as it was released in my city and used it till I lost it a month ago.
I'm really careful about my gadgets. I keep them safe and right, no harsh use our anything.

So moving on, the problems I've been facing with the Z1 are :

Phone randomly switches off or restarts on its own.

The backlight stays on even after I've locked the phone,. I've tried checking / un-checking the optimise lighting option. Nothing helps. And the problem only gets solved after I take a pen and stab the red OFF button.

Another really annoying problem I've been facing is that there is a delay while talking on the phone, like my voice reaches the person after a long gap of 2-3 secs. It's made talking on the phone impossible.

I don't have too many apps on the phone, restart it every other day or when I make changes. Keep it clean and right.
Idk what's wrong. I'm really disappointed after spending so much money.

[Sam]

For the audio delay when on a call I would actually advise speaking with your network provider as it is very unlikely that your phone would be causing this.

For the restarting issue, given what you have said I would advise running an update/repair if you have not already:

1. Download the PC Companion software from http://www.sonymobile.com/gb/tools/pc-companion/
and install it on your PC.
2. Install and open PC Companion then select Support Zone.
3. Phone Software Update.
4. Start.
5. Repair Phone
6. Continue
7. Accept data removal
8. Next
9. Wait for prepare
10. Select Phone
11. Follow the connection steps

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[t_k]

Well I've already tried talking to my network provider, they said there were no problems from their end.
And another thing I forgot to mention was that talking on the phone is slightly better if I talk with the speaker option enabled, otherwise the other person can't make out what I'm saying at all.

And my phone is up to date but I'll try the repair thing and see if that helps

Thanks

And what about the backlight problem, I Googled it and it seems like a huge problem with the phone, too many people are facing it.