Reported sensor issues with Apple’s iPhone 5s are being caused by a new and allegedly undercalibrated accelerometer in the device, according to a new blog post. Eagle Jones, CEO of developer RealityCap, writes, “Quite definitely, the answer is that these issues exist due to hardware design.” Jones points out that a recent Chipworks teardown identifies the 5s accelerometer as a Bosch Sensortech BMA220 — Apple previously used parts…