IPhone acting really weird since vacation?

Ok, this is a long story.kind of.
before i went to vacation, my iPhone 3GS iOS 5.1.1 (thats what it said when i bought it from ebay) was acting fine, and fast. Just normal.
after that i got to the place i went on vacation to. The sim card for that place did not work. We had to take it to a repair shop. After that, they had to flash my phone, they had to restore it. They replaced the whole motherboard. Then the sim card worked fine. After that, i got something way better than an iPhone, so i used that a lot. Then my phone just… You know.died, and didn't turn on… Unless i put it on charge and waited until it was 100% then whenever id try to make a call, it crashed! And it wouldnt turn back on until i put it on charge.whenever i played a game it crashed! Not all the time. But it did.

i came back home and it would do the same thing.one night i put it on charge when it crashed and it said to connect to iTunes. I'm trying to restore it now. If it works. I got lucky. But if it doesn't.

IPhone is very popular to the young generation. It is very multifunctional electronic device. As the SIM card was not functioning so there was no way but to flash your phone and replace your motherboard. You have to cheek the charger as well as the motherboard again.

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