For the last week or so, I will randomly have an issue where I can't send or receive texts or calls, even though I have full bars. I won't know this is going on until I try to send a text and I get an error message saying that I don't have any service. I have to cycle my phone through airplane mode, wait for it to finally pick up the network again, and then I'm flooded with texts and missed calls/voicemails. This is unacceptable. What is going on?