Pi Cam

Guys, has anyone had issues with the pi cam presenting pixelated images? I’m streaming over 4g and the first half dozen times I used it the images were very clear and the stream delay was approx. 100ms. Now it’s very “blocky” and starts up on a green screen sometimes. The stream speed must still be there because I can wave my hand quickly in front of it and it still picks it up but leaves the screen confused and blurry after a few seconds it will clear up on its own but as soon as I wave my arm or move my bird quickly it will blur again. Cam bad? Any thoughts?