There are many possibilities. Have you done the obvious? Check settings,make sure apps have access all the time just to make sure? Have you factory eraser the phone and set it up as new to eliminate typical software variables?
Does the gyro sensor and accelerometer work? You can check this in the compass app usually. See if the compass spins accurately. Does your phone switch rotations when turned? These sensors help track movement of your phone as well. But you definitely need to rule out software issues if you haven’t already.