Memory crash question, galaxy s7 gear vr, lots of textures

My gear vr application is crashing due to running out of memory. I know I'm using a lot, but I'm running on a Galaxy S7 with 4 Gigs of ram, so I was surprised to see my memory usage was below a gig. I'm wondering if it's an issue of allocated memory too fast, and not the total size. I can load and unload to address the issue, but would prefer to keep the textures ready. Here's the memory info from the profiler right before it crashes. Unity 5.4.1, android 6.0.1.