Xperia Z disconnects all of Wifi! :( - Xperia Z Q&A, Help & Troubleshooting

Had my xperia z about a month now this current one two weeks. Since day one the phone will disconnect everything in my house all at the same time roughly 10 minutes after being connected itself. Any ideas as to why? I took the phone back in the first place where i bought it and got it exchanged for a brand new one but when i got home the same problem was there.
Any help??

Have you tried this?

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Went to the Verizon store, got a new battery, plugged into the charger and within 20 minutes that too got fried as well. So it was the phone.
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[Q] Galaxy S Advance won't switch on/charge

Hello, this is my first smartphone and I really don't know too much about this stuff. This being my first major problem (I purchased the phone around 7 months ago), any help would be appreciated.
My Situation
Phone was in perfect working order till today afternoon, when it suddenly switched off. I assumed it had run out of charge even though I usually get more hours of battery life. I tried to charge the phone 3 hours after it switched off. It didn't show the charging icon and I couldn't switch it on.
What I have already tried
1. Taking out the battery and SIM and putting them back in again.
2. Vol Up + Home + Power
3. Vol Down + Home + Power
4. Connecting phone to Kies (Phone not detected by Computer or Kies)
Additional Info
This information may be completely unrelated to the problem, but since I'm a complete noob, I'll add these:
1. Phone was upgraded to Jellybean by official upgrade, many months ago.
2. Phone is not rooted.
3. Only downloaded apps from Play Store. Got only one setup file of an app from a friend around 4 months ago, and deleted it after a few days.
4. Bought a new back-cover around one week ago.
5. A few days after I bought the new cover, the phone heated up and became really hot one day. It cooled down normally after half an hour or so.
6. Today in between the time when the phone switched off and the time when I tried to charge it, the phone heated up again in a similar fashion (NOTE: This was AFTER the phone stopped functioning).
Thanks for any help.
Well, if you cant go into download mode, I think its better to go with the phone from where you bought it and they will send it in assistance and in some days it will be fixed, same thing happened to me. Hope i helped
Lorenzo39 said:
5. A few days after I bought the new cover, the phone heated up and became really hot one day. It cooled down normally after half an hour or so.
6. Today in between the time when the phone switched off and the time when I tried to charge it, the phone heated up again in a similar fashion (NOTE: This was AFTER the phone stopped functioning).
Click to expand...
Click to collapse
This is weird.
Go with your phone to service center, seems you have some hardware problem.
Thanks for the help, guys. I agree it's weird. I'm going to take my phone to the service center tomorrow. I just didn't want to lose all my stuff, because it's been a long time since I backed up my data. But it seems I'm out of choices. Thanks, again.
I was facing the same problem, bought the micro usb module for about 12 € and i replaced it, all went good :good:
Hououin said:
I was facing the same problem, bought the micro usb module for about 12 € and i replaced it, all went good :good:
Click to expand...
Click to collapse
If Lorenzo39's phone is still in warranty is not worth to do it yourself.
Must going to service center for his warranty precedure.
Good luck @Lorenzo39.
R_a_z_v_a_n said:
If Lorenzo39's phone is still in warranty is not worth to do it yourself.
Must going to service center for his warranty precedure.
Good luck @Lorenzo39.
Click to expand...
Click to collapse
Indeed but if the connector is oxidized (probably it is) the warranty doesn't replace the module, or they do with payment (lot of $)

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Some of my Xperia Z stats:
C6603
Android 4.4.4
Stock ROM
Build number: 10.5.1.A.0.283

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