Iphone 4 keeps being glitchy?

Sometimes it will just shut off randomly and i have to reboot it. Don't tell me its cuz of the battery its not. It just happened and it was at 50%. The battery also dies within 15 hours (which i believe to be normal) apps also crash sometimes and my instagram and camera apps are extremely glitchy. I've tried deleting photos and so forth but nothing works! Please tell me what's happening?

Best iPhone5s carrier plan for me?

It can be a plan or monthly, but I was thinking just a 16GB iPhone. I text a lot but maybe a few calls here and there. Pretty good speed. I will have like twitter, instagram., snap-chat, and a few games.
I've been really lost with all the carriers. I want a pretty decent price, the cheapest would be nice.
My mom also has an Iphone5s and has Cricket and I though I could make a bundle and piggyback a phone to her plan and make things cheaper, well cricket won't accept that at all. And by the way, i don't like there standards anyways, but I don't know what to do.

Need a replacement for iTunes?

I've got a lot of music I want to put on my iPhone but on my computer iTunes just doesn't work, I've uninstalled it and everything but it still doesn't work so I need a free replacement that works with my iPhone

Any quality free MP3 music downloading apps for iPhones?

I just recently got a new iPhone and lost all my music and when I redownloaded my old music app it wasn't the same. It gave me a limit on the songs I could download and the "pro" version which you had to pay for SUCKED. I looked for the old app but it was removed from the App Store. Can someone help me out? I'm miserable without my music.

I dropped my IPhone 4 in Car Oil

Ok so I dropped my phone in car oil for like maybe 3-4 seconds and I got it out and cleaned it up and now it looks normal now except it has oil behind the screen and I don't know what to do cause i'm scared its gonna break, Do I have to take it apart or do I have to sit it up to where it comes out of the hole where the charger goes, please someone help me! Please answer As soon as possible thanks

Is lifeproof 100% guaranteed for waterproof?

Just went swimming with my lifeproof case on and of course the sound doesn't work anymore. The vibrate works and under he vibrate settings where you can adjust the sound. That works for some reason but when I call someone I can't hear the ringing or them. Can't hear my music or anything in YouTube. My question is, do I have to pay $269 for a replacement since it's an iPhone 5s and I don't have a warranty for it? This is such bs. Is lifeproof going to do anything about it or no