> Any idea what could be going wrong here?

Neildude, I use this 628 routine, a little different to yours but it
works OK. Note that bank0 and bank1 macros or BANKSEL
address both RP bits

         bank1
         movwf   eedata   ;data already in W
         bank0
         movf    eea,w    ;eea is a Bank0 variable
         bank1
         movwf   eeadr

         bcf     intcon,gie
         bsf     eecon1,wren
         movlw   0x55
         movwf   eecon2
         movlw   0xaa
         movwf   eecon2
         bsf     eecon1,wr     ;initiate write

         bank0
         btfss   pir1,eeif     ;wait for write complete
         goto    $-1
         bcf     pir1,eeif
         return

I wonder if there's a complication with the timers in your app ?
Maybe when you re-enable the interupts there's a flag set that
causes an ISR to be executed. Perhaps test the flags before
you re-enable GIE

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