How old is it? If less than 30 days, I would take it back to the store (if you bought it from one.) Otherwise, I would not waste any time in calling Bushnell about this.
As for the batteries getting hot, unless it is a dead short, anything that has a high resistance may drain the batteries quickly, but won't let them get very warm, if warm at all.
Texas CHL Instructor, NRA Life Member, NRA Certified Pistol Instructor and RSO
If it walks like a duck, and talks like a duck, you're drunk; Ducks don't talk.