Toyota 4 runner stalling

I have a Toyota 4 runner model year 2007 that stalls after it hasn’t been used for a few days. I live in the city, so i’m doing short drives. The first time it happen i hadn’t used the car in 3 days, and today was the second time, i hadn’t used the car in about a week. I brought it to the dealership, after the first time, but they couldn’t find anything wrong with the car. Any suggestions as to what might be causing the problem?

Stalls when? Under what conditions? Will it restart immediately?