I described the panic.log problem in the iPhone and iPad in detail on my blog (address in the "about me" tab), but I don't remember the name of the device. Perhaps it has to do with the evolution of the IOS version so you can try a solution by analogy. Before that, however, a few questions:
- under what circumstances did it happen.
- How often a restart occurs (in seconds - measure with your watch)
- was the tablet repaired, if so, what, where and when
Can you share the entire panic.full of this crash?
in general, it seems to me that this is a problem related to the sensors of the Watchdog system. It is a systemic process with a programmed cycle of examining external sensor data. The cycle is cyclical, as the name suggests, and has a value of 180 seconds. If the measurement interval is not interrupted by incoming (confirmed) data, the system will start a failover, hoping that a system reboot and current sensor start will solve the problem. To find a missing sensor signal, analyze the incoming data from Panic.Log. Perhaps it's a new form of screen sensors, in the case of Pro12.9" If the screen was replaced, it seems quite likely. So the problem will be related to the interface soldered in the signal tape of the screen.
If a technician in a repair shop suggests replacing the battery as a repair method like yours, without providing diagnostic evidence (because sometimes battery failures happen) run away from this place, because the technician has no idea about the principle of operation of the Apple tablet and certainly does not have the competence to repair such a device.
I hope I have shed some light on your problem. Good luck.