Well, he could be bored, there could be little bugs living under the siding that you guys arent aware of (yet ), he could be looking for a new home but I kinda doubt that one since he only does this once a day?

Unfortunatly I don't know a good way to scare away birdies ((Obviously since we've got 5 of our own and bird feeders all over the gardens ))

The dishtowel idea sounds like itd work Maybe try a scarf though since its lighter and will pick up more air