My z10 will remind me of calendar tasks for approx 2 days max. After then my reminders will stop but the appointments can still be set I just done get a reminder. The only fix so far is to restart the phone. My cell provider says wait for the next update there's fixes coming to the software. Well the newest version came out and still in the same boat. Does anyone know of a fix. Right now I'm just considering swapping it for a new one and considering it manufacture warranty.