I've had this issue and what seemed to be the problem is the phone will lockup in standby after about a day or so. To prevent this from happening, I have been soft reseting my phone every morning. What I also noticed is if you send a text or end a call and hit the power button too quickly, it locks up the line on the phone until you hit the power button again. After the phone resumes, the line opens and you get your missed text and missed call.
Anyone else think this is the reason?
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