Hot Phone

so after playing game on iphone 6+ for 5 mins device gets hot and fps drops from 60 to 40.

im thinking its physics.

internal profiler says:

iPhone Unity internal profiler stats:
cpu-player> min: 9.0 max: 21.7 avg: 16.4
cpu-ogles-drv> min: 0.0 max: 0.0 avg: 0.0
cpu-present> min: 0.0 max: 0.0 avg: 0.0
frametime> min: 9.2 max: 22.0 avg: 16.6
batches> min: 62 max: 66 avg: 63
draw calls> min: 68 max: 72 avg: 69
tris> min: 12267 max: 13691 avg: 12925
verts> min: 15657 max: 16911 avg: 16234
dynamic batching> batched draw calls: 78 batches: 13 tris: 3457 verts: 3492
static batching> batched draw calls: 78 batches: 13 tris: 3457 verts: 3492
player-detail> physx: 6.7 animation: 0.7 culling 0.0 skinning: 0.0 batching: 0.5 render: 4.4 fixed-update-count: 0 .. 1
scripting-scripts> update: 0.7 fixedUpdate: 2.4 coroutines: 0.1
scripting-memory> used heap: 901120 allocated heap: 1052672 max number of collections: 0 collection total duration: 0.0

does this sound like a lot of time for physics?

or ram looks high?

Researching, I cant seem to find any reference points or ways to calculate if that is too much.

help appreciated,

J