Have they got some timed auto shut down system in operation if your are not using it. I remember someone mentioning it before but I'm not sure if it was BT. Send em an email and ask if no one can definitely say.
OnePlus 5T review: Hands-on
Illustrator Andrés Lozano on his improv line work, brazen use of colours & hand sketching
iPhone X review
Comment envoyer gratuitement des gros fichiers ?