Leaving a tuner permanently clipped on like Gulliver makes sense - I've got a ukelele I tune like a mandolin (except it's single strings of course), and I leave the tuner on because it always needs the tuning adjusted every time I play it. Great fun to play for all that.

The other thing that can mess the tuning of course would be if the actions a bit too high so when you fret up the neck you are stretching the strings.