Whats wrong with my Xbox 360 Slim?

I bought my xbox 360 slim 250GB 2 years ago and last summer it overheated i hadn't played it in a week and it just overheated 20 mins in and now this is whats happening

1.Overheating alot now it does it 75% of the time i play it

2.Unable to load data for any multiplayer games. i have to restart it 2-5 times just to load up BF3 and Cod's multiplayer without it acting like ive never played the game before

3.It always disconnects me from LIVE every other device works flawlessly my PS3 fatty which is farther away from the wifi router stays connected. The xbox acts as if there are no connections even though its across the room from the router and the ethernet port cant work right either

Recap:

My connection is 5/Mbps and Xbox has always been in range except for now and i don't even mess with the router box

The only time i moved my xbox was in december and i moved it to the bottom Shelf to make room for my speakers

It overheats WITH the inter cooler and a fan blowing on it

it refuses to load data