I'm thinking if it recovers after a watering that it may be more dry than too wet. As Elaine suggested (and assuming it was planted from a pot) the pot needs to be watered well before planting because it can be hard to get water into a dry rootball after planting. There can be problems with water - and roots - crossing from one type of media into another. (BTW did you amend the backfill for the planting hole, as this is no longer recommended for that reason unless the native soil is really terrible).
However, you mentioned disturbing the roots "some more" which may mean you did something to the rootball before you planted it? If so it can take a while for the roots to become established and support the top growth. It's also planted beside a garage which will make it hotter when the sun shines depending on the orientation and increase its need for water.
So I agree to dig down a little beside it and see what the situation is if it was planted with an intact rootball. I'm not sure I would do that, though, if the media was removed from the roots and it was planted bareroot as you would then disturb the roots that are trying to establish.
