Why does my Wi-Fi come and go?

So I was simply using my iPhone 5 (I have T-Mobile 4G LTE) and then usually the 3 bars will always pop up. Then something happened that says "LTE" it was like that since yesterday and apparently I got no Wi-Fi. I disconnected and connected. I have 2 Wi-Fi names that work perfectly. One connects and disconnects itself. And the other one dosent connect at all. What do I do? Is their something I have to unplug and plug again so make it work again?

IPhone 4S shutting off randomly?

Okay so I have a iPhone 4S and it keeps shutting of randomly. It is on update 7.0 should I update it and if I do will that fix the problem. It only works when I have a charger connected or should I go to a phone store? I can't go to a apple store my town doesn't have one.
It is out of warranty so I don't think I can get it replaced please help

How to transfer videos from my iPhone 5c to a regular windows 7 laptop? No Mac?

I just transferred my pictures and videos to my laptop and everything was good until I noticed that the videos I transferred, every time I played them, they would play sideways! And I hate that! I don't want to turn my head sideways every time I watch a video. Is it suppose to do that? Or is there a way I can rotate it clockwise?

I would like to know about the scam of selling electronics in very cheap price?

Dear all,
Nowadays, there are many people who are selling iphones and many electronic stuff such as smartphones i pads and all laptops for such a low price for example iphone 5s 64 GB which is 71000 INR in india the sites are selling in 21000INR. I would like to know the reality of such sites?
Whether to believe or they may be scam?