Several iPad Pro 10.5 owners have voiced concerns on the Apple Community forums that their device is stuck in a constant boot loop every 180 seconds after performing an iPad OS update to 13.4 or above. The issue, which does not seem to occur in iPad OS 13.3.1, is not apparently resolved even after a DFU reset. However, squeezing near the battery area seems to have had some degree of success.
https://www.notebookcheck.net/Apple-iPad-Pro-10-5-owners-complain-of-constant-reboots-after-updating-to-iPad-OS-13-4-and-above-squeezing-near-the-battery-could-be-a-temporary-workaround.466989.0.html