IPhone 4S Battery - Switching itself off

Hello,
For the past few months I've noticed a problem with my iPhone 4s.
When the battery drops below 50%, but usually arround the 20-40% mark it will switch itself off.
I try and turn it back on and it shows me the symbol that says it needs charging.
If i leave it for a few minutes (between 5 - 15) I'll be able to switch it back on and it'll show with 20/30/40% battery.
Or if I plug it in to charge it'll switch on immediately and again say I have 20/30/40% battery.
It used to happen once in a while, but then started to become more regualr, happening a couple of times a week.
So I took it into my local Apple Store and they ran a diagnostic on it, said that it wasn't showing a battery failure, but if I wanted to pay £130 they would replace the battery for me.
Has anyone else had this issue? It's completely random so hard to replicate in store, it just happens.
My iPhone is about 18 months old if that makes any difference.
Thanks

Forgot to say:
I've restored my iphone a few times since then and still happens.
And the woman at the Apple Store said she'd never come across this problem before.

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