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I recommend examining a heap dump to understand the root cause.

I'll prepare some heap dumps with VisualVM, is there any other option to gather heap dumps?

you can pass a JVM flag to dump the heap on OOM:

-XX:+HeapDumpOnOutOfMemoryError

Might also be normal operation? Android builds do take a fair amount of memory so I'd give the build at least 2GB of RAM, maybe more?

We've set 16GB of ram and still failing

Uh oh yea then memory leak somewhere looks like..

I'll come back to you all with my findings. @no thanks for the flag