Turning off Bloodhound Heuristics - Bloodhound.exploit.252

For the past several months, I keep getting bloodhound.exploit.252 alerts, sometimes three or four a day, pointing to excel files I know are absolutely clean.  These messages are extremely annoying.  I see a number of other Norton users experience the same issue, but there seems to be no universal “turn off,” at least a quick and simple one.  I’m on the verge of un-installing NAV and switching to an alternative AV product.