So I'm leaving my college house to go back home for both Thanksgiving and Xmas breaks. Our house has been broken into twice during breaks this year (December and June). I put in a solid door on the back porch with 2 deadbolts (it was hollow with one deadbolt) and also put an extra deadbolt on the front glass panel door that can only be unlocked with a key from both sides.
It's probably the same perp. Have you given thought of setting up a simple video surveillance inside and outside the house? or maybe a silent alarm to alert the police?