IPhone 4S keeps connecting and disconnecting from laptop over and OVER again?

It has been happening for a while but lately it is unbearable. I charge my iPhone on my laptop so all my data backs up and its more practical for me as I use the laptop whilst it charges. Lately it connects and disconnects immediately! It has this "fit" of connecting and disconnecting my phone just goes mad! Works fine when plugged in a wall socket. ITunes is up to date, iOS up to date, it is the only USB plugged it in my laptop and my laptop is a new laptop! I have tried switching my phone on and off but it does nothing, I also checked my USB power from my laptop and it is 500mA per port ( usb 3.0)
Any Suggestions please!

IPhone 4s (Sprint) on tmobile network?

I've read a couple of articles and forums on this subject but my case is a little different. I bought an iPhone 4S from my bestfriend so I can give it to my boyfriend for his birthday. (He has a flip phone currently) lol
Anyways, her carrier is sprint. I put my tmobile SIM card in it to see if it was unlocked and it seemed to connect just fine? This is probably a dumb question but do I still need to unlock it with sprint or anything? I don't want it to still need to be unlocked when I give it to my boyfriend.

AT&T iPhone 5 activated to verizon?

I have a unlocked AT&T iPhone 5 but the carrier on the phone still says AT&T?

Can I just take it into Verizon and tell them it's unlocked and they can switch my iPhone 4 over to the iPhone 5?

How to turn iphone back on without lock button?

I turned my phone off with the assistive touch and now I can't turn it back on. I just tried plugging it into my computer and just an outlet but it isn't doing anything. How do I turn it back on?

Is iPhone 5s better than iPhone 5c?

I'm thinking of getting one pt the other for prepaid and ik the 5s is more but is it really all that better if so y I don't understand iPhone stuff but ik I love the 4s but wanna upgrade if you could simplify it for me that would be great thanks. Oh and anyone who is hating on me just cause they like Android and think i'm just sum one just wantimg it to be cpol i'm not I love them cause there phones are tough as nails and there os is way better than Android i've had Android and they break very easily and there keyboards alway glitch and suck at responding and I don't like having to keep on resetting it to factory default settings every week none of those things go wrong with iPhones so please leave it at that thank you

Should I purchase a new iPhone 4S?

I wish to buy a new iPhone 4S.
iPhone 5 is already in the market and 6 might be coming soon.
Should I buy one 4S?
I fear if something may turn outdated and cause me trouble later on! I have budget only to buy upto 4S, so can't buy 5c/s.
My phone can last upto 3 years roughly, so according to that, should I go for 4S?

What iphone 5c cases should i get?

Well I was looking up in ebay for cases but there all to plain ^O^ so I wanted to know if you guys can give me some suggestions on what cases I should get… They have to be cute though.