Call keeps dropping due to off grid when lot is not off grid

Now, i honestly don't know if this is because of my cc or if its in the game, but I recently played with my Sim and whenever she calls someone, she gets an angry buff saying the call was low or poor quality because its off the grid. I never set anything as off the grid. It does it at her house, at the gym, when she visits a lot, it just does it.