Mine was playing up this afternoon, the usual unable to read data because of “Battery Protection” issues.
Went out, opened the car, got in, switched it on as usual, gave it a minute to start the system up, then got out and locked it.
2 mins later and the App now reads the car data.
Please excuse spelling/typos. Apart from being a clot it turns out I had one on my cerebellum that's now causing various problems!