I'm using Maxxis flavour super light inner tubes/Ksyriums/Ultremo's on the roadie. I've had a couple of failures round the base of the valve stem. Not riding along. It's when it's left overnight, I come back to it and find a flat tyre. There's no obvious physical reason (sharp edges, lack of tape, valve cocked at an angle etc).
Any suggestion over why and how to avoid please?