Believe it or not, when you hear a pop, it is a fuse blowing on a pole and not a transformer. Also, the momentary interruptions you see are devices on the line that attempt to clear a fault. Generally, a recloser or substation breaker will operate three times before locking out. If a branch falls and causes a fault then falls to the ground, power will be restored automatically. If it remains remains on the line, then the device will lock out and require manual intervention once the repairs have been made.