Linphone crashes during call

I have installed Linphone on an Altera SOCFPGA running linux. It works fine on most systems, and I can make calls and receive calls. However on one system, shortly after a call starts, the whole system crashes, such that a power cycle is required to get it back. What could cause one system to crash, whereas others don’t? And how can it crash the whole system, not just linphone?

Cheers,
Simon