> > Also, it might be better to re-enable interrupts only if they were

> Unfortunately for this app, they must always be enabled

Can you arrange for the code to be executed in between timer
interrupts ? ie wait until both TMR0 and TMR2 IRQs have just
occured before entering the EE routine

In your original code you clear WREN after setting WR. All examples
I've seen (eg 13.2 in the 16F628 manual amongst others) simply set
WREN. Have you tried it with that taken out or putting it somewhere
else? However, once WR is set, anything short of a reset won't stop
the write so that could be chasing rainbows

IMHO I think you should verfiy that program flow really is getting
stuck in this routine

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