moving it in and out often isn't a good idea. you are providing 2 drastically different light sources. the leaves are used to one or the other. also, you'll just end up with bugs and other contaminents in your indoor grow space.
some stress can make the plant a little unhappy. it'll take time for the leaves and such to re-orientate afterward.
If it is floppy / wilting, then it is most likely from the sun being too intense. remove the moment it wilts if exposing to outside... it'll slowly acclimate itself.