When my power cord is moved while plugged into my iPhone 5s, it often loses connection and charging stops and the green loading symbol turns white-on-black, usually going back to green and beeping when connection comes back on. This also occurs when using a new cable, and also when loading from...

I am in search for an adaptor that has a female lightning and a female USB. Doesn't have to be a long cable. I have found one online but it is no longer available. Let me know if you know where to get such thing. Thank you.

I have bought many iPhone 4 cables, mostly from amazon (where they are labelled "certified by Apple USB cable for APPLE iPhone 4/4s, ..."); with some of them the iPhone "bings" and starts loading, with others nothing happens. It seems to have to do with the source, but not always. For example, I...