I had this happen to me over the weekend. Received texts up through Saturday night, and then none. I didn't figure it out until I was the one phone in our household not receiving update texts from my daughter's school that we had subscribed to.
I ended up shutting down and restarting the phone and it seems to be working since then.
What made it harder to track down, was that only SMS was effected, but MMS, which included group chats, worked fine and I could still send out, but not receive.
Made for a bit of embarrassment when I sent some texts to another parent on Sunday and sent a follow up asking if they had gotten my earlier message. When I saw her a couple of days later, she showed me where she sent about eight responses to my two texts, but none of them ever made it to my phone.