Dear ZWO,
The bug of not finding the Sun automatically is still present (after all calibrations done, of course) and as I experimented, the problem is always that altitude is not correct, mainly when the Sun is at about 46-48°. The telescope will go just above the Sun then say "Failed to find the Sun".
So my suggestion is that before finding the Sun would fail, the scope should return to search the Sun about half degree below and would find it. I think it requires some changes or optimization in the software. Thanks!