I got my wireless charger yesterday and was super excited. When my battery ran out I put my 920 on the pad last night and charged it all night. When took the phone off the pad at 11 am the battery was at 100% but but within 3 hours the phone was at 20% through very light use (texting and three 5min calls). I've had to charge the phone 3 times today to get to now. Previously my 920 could last 12+ hours on one charge. Anyone else get the this problem?