Why does my iPhone 4 keep going into recovery mode by itself?

It started randomly about a month ago. Ill be using it and ill turn the screen off and ill go back to it later and itll be off. I hold the power button and nothing. I plugged it into my computer and it said its in DFU mode or recovery mode one of the two and it tells me to restore. I just do the hold power and home button method but since this was random what could be the problem? It was working fine then it started happening and this has never happened before. I'm reselling it so I wouldn't want this problem happening.

Changing IPhone 4S sim. Contact

Hopefully today my new sim is coming with a much better contract. I use a iPhone 4S and I'm wondering how can I do it so all my contacts are saved into the phone so all I do is change the sim and it's fine?
Best answer for clear and detailed method.

Why is Netflix not loading on my iPhone?

I'm trying to watch Doctor Who which is about 45 minutes per episode but when I try to watch it the video doesn't even load and I get an error message. I'm using T-mobile 3G on an iPhone 4 because our internet went down. Can I watch Netflix at all or do I just have to watch shorter videos? I'm getting around 2-3 bars right now if that makes a difference.

Why are my Mac text replacements messed up?

Okay, so at one point, I had changed the text replacement on my iPhone to use Emoji symbols. Well, that became old very quickly, so I removed them from my phone. But I noticed on my iMac that the text replacements had somehow synced over. So for instance, whenever I typed. The Emoji smiley would pop up. I went into System Preferences > Keyboard > Text, and there were none there. It was somehow doing it by default. I added new text replacement [i.e.: :) = :) and. = :( ] so they at least are replaced with themselves. But as soon as I remove those, it reverts right back to the Emoji replacement.

Iphone restarting could it be hacked?

Hey every now and again my iphone 4s with ios 7 sometimes randomly restarts without even doing the little spinny circle thingy the apple logo just comes up and resumes is this a hacker accesing my phone?

I can't quite find what I'm looking for?

I'm looking for a Ansem Seeker of Darkness wallpaper for my IPod touch 5 Generation. I know the IPhone 5 and the IPod Touch 5th Gen. Have the same screen resolution but I can't seem to find an Ansem Seeker of Darkness from Kingdom Hearts wallpaper for IPod Touch 5th Gen.