On further investigation of my instance, there appeared to be no high logging volume to the console, nor anything using the /dev/ttyS0 other than agetty. Switching from the generic kernel to the AWS kernel seems to have stabilised it.
On further investigation of my instance, there appeared to be no high logging volume to the console, nor anything using the /dev/ttyS0 other than agetty. Switching from the generic kernel to the AWS kernel seems to have stabilised it.