phone not getting texts?

so every once in a while, my phone will stop getting texts and phone calls.
the reason i know this is that every once in a while when i get home, i get yelled at by my parents saying that i never picked up their calls and responded to their texts.
then ill do a battery pull, and all the texts will come in at one time. im assuming that missed calls dont normally show up after a battery pull.
during the time that i couldnt recieve any texts and calls, i could still use data though. i could still surf the web and use apps

my questions is,
is this an issue with the phone or att?

and is this an issue i can go to warranty about?

AT&T has been notorious for this issue especially recently. It's not a device issue.

Every so often my texts dont come through unless i do a battery pull and my mums does the same so it must be all blackberrys that do it, so doubt anything is up with your phone.