@Moderator
Update: Issue appears to be resolved.
I disassembled the VOXL2, WiFi board (M0213), and ESC connections, cleaned the connectors and contacts, and then reassembled everything.
After reassembly, the system has been working normally. I've completed multiple test flights without experiencing any random reboots or WiFi disconnections.
It seems the issue may have been caused by poor electrical contact or loose connections, although the exact cause has not been confirmed.
Thanks for your help!