I have daydream turned off.
Unfortunately I am also seeing charging problems. We have especially seen it in the car. The car chargers we use are those recommended in http://thewirecutter.com/reviews/best-usb-car-charger/ (e.g. a Scosche and an Aukey) - they successfully charge my phone (a Sony Z2) and are rated more powerful than the original Hudl charger so I don't think they are at fault. Neither is the cable - a portapow one.
Rebooting/turning off does seem to help but is extremely frustrating - it would be helpful if this could be fed back to Tesco ;-)