I tried Jerson's suggestion to move the clearing of mismatch and interrupt flags to MAIN loop just before SLEEP statement instead of at the end of the Int_Handlr and it didn't work. It appeared to create continuous interrupts into the Interrupt handler without activation of any of the switches to do so.
When I put the clearing of mismatches and interrupt flags back at the end of the Int_Handlr just before RESUME the interrupts work correctly again.
Therefore, this suggestion to get the MCU back into deep sleep after servicing the interrupts didn't work.
Any other suggestions from anyone out there on how to get this back into deep SLEEP after the interrupts are services??