It happened to me last night. I couldn't stop it without rebooting the phone. A look at the Verizon forums show that both Verizon and HTC have no answer. I turned my phone to allow roaming on all trips and not to play roaming alert sound. We'll see. I'll give the Facebook disable a try if that doesn't work. I love this phone but this could be a deal breaker and may force me to the S4 before my 14 day period is over.