We're still looking into this particular problem.

As an update we had QA running through the fight for a good 2 hours or so on multiple devices in different circumstances. In most cases there was no crash, even streaming spotify and leaving a lot of apps running in the background. The patch had some optimized effects in it however, which will reduce the strain in the fight on the processor and help some.

Players still experiencing the problem are encouraged to respond with any additional information they wish to share, such as what apps they have running the background. It may help point at a specific 3rd party application or other unifying reason that this crash is happening. It may not yield anything, but you never know.

Thanks for your patience on this guys