MAX232 Overheat

Hello.
I have some problems with the MAX232.

In some cases, when I pluga and turn on the system (with contains the max232), the IC will be inoperated and overheat too much.
In other cases, the RX will work OK, but TX not work.

I don't know wich's the cause of my troubles...

I hope help me.

Best Regards
fede