IPhone 4 is hot on the right side?

I would like your opinions on this: My iPhone 4 is getting really hot on the right side (screen facing me); where the ram is and those other stuffs. It just gets really hot when I text for a while like around a few minutes and I don't text very often. I use my phone for studies and reading and social network but only for a couple of hours. When it gets hot the battery life is decreasing all of a sudden. From 43% to 30% in a matter of minutes. Also when I'm charging it, it also gets very hot and it takes too long to charge, it doesn't even reach 100% overnight and when I use it while charging the battery life decreases. This whole overheating thing happened when I got it back from a shop because I had to replace the entire microphone thing seeing as I can't be heard by the other party.

Replace it.

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