State Clash between LrWpan PHY and MAC when sending ACK
I am currently experiencing a similar problem (maybe the same) to the one described by @roberthartung1 in Issue #428 (closed). I tried applying his fix, but unfortunately it does not resolve the problem completely. While using his fix some simulations still crashed, but in other parts of the PHY and MAC code. The core issue seems to be, that after receiving a packet the radio switches to RX_BUSY again, before the ACK can be sent out.