...
Under Security, there is an option in the latest firmware for PayDroid called "Scheduled reboot time" that should be setup on each device. If left with default the site could encounter "System reboots in (X) seconds for routine security check" during the day, and it may interfere with a transaction in process:
The time should be somewhere overnight, preferably after the batching and before the site is open, perhaps 5:30AM if Batching is at 4AM and the sit opens at 6:00AM.
...