I have a problem with the I2C-Comunication:

I´m clearing & setting the EA-Bit (Enable all Interrupts) in the I2C-Comunication. If I do this, the code doesn´t work, if I don´t, it works.
Does anybody know if clearing and setting the EA-Bit IN the I2C-ISR has an effect on the I2C-Comunication?

My code looks like this:

void I2C_ISR(void)
{
.
.
EA=0;
.
.
EA=1;
.
.
}

thanks