xdot peer2peer send failed

Hi all.

After sending multiple frames in P2P mode with TXP=4 in DR3, the XDOT replied “send failed” to a SENDB command.
I checked TXN in case there was a limitation, but the result was 0. Tried multiple times to manually send the frame and always the same result, send failed.
After several minutes, the SENDB command worked magically.

Is there any limitation the firmware is not telling me? I mean “send failed” is really ambiguous.

Firmware version on the XDOT is 2.0.14

Thanks!