Argh!!!

I had my iPhone for seven months and after the update to iOS4 it completely messed up my phone. Everything was running slowly, the keyboard barely responded, subsequent updates made to rectify the problem ended up being useless so I sent it off on Monday for repair. The new phone arrived on Wednesday and I was super surprised by the speed of delivery and glad to finally have it back so I was in a kind of iPhone daze until last night. I couldn't sleep and so decided to have a trawl on the internet when I noticed light escaping from the rubber seal between the screen and the metal ring, it turns out the screen isn't properly sealed onto the phone!! I then noticed there was a dead pixel on the screen and although it's not the end of the world it's ruddy annoying. And then all of today it has been malfunctioning, constantly bringing up the message "SIM card not installed" and cutting off signal completely until I reboot the phone. Nothing is wrong with my SIM card as it has functioned perfectly the last seven months in my first iPhone. Anyway, I have to return it again so they can send me another one out. It's ridiculous!!!!!!!!!