Thank you very much for your comment.

I also initially suspected CPU starvation or the UDP sending rate,
so I performed several tests to verify that possibility.
However, the behavior I am observing seems a bit different from typical CPU‑load issues.

Here are some additional details that may ...

Environment:

Chip: ESP32-C5
ESP-IDF: v5.5.4
Mode: SoftAP (single STA connected)
Application: Real-time audio streaming via UDP/RTP (2ms period, 1152 bytes/packet)
Problem:
I'm experiencing periodic sendto() failures with errno=12 (ENOMEM) approximately every 1.5 seconds. Each failure burst consists ...