Running MacOS Sierra on a 2015 MacBook Pro. Clean installed on a freshly formatted SSD from a terminal-made flash drive. With some regularity, I am unable to wake my MBP from sleep. Even when it's been connected to power throughout, opening the lid brings me to a black (but backlighting on) screen. The cursor shows after ~10-20 seconds, but the machine is otherwise unresponsive. Key shortcuts to force account logout do not work. A manual reboot is required. Am aware that in the beta, there were widespread issues with Sierra not waking from sleep. This was often attributed to (a) beta; (b) third-party display drivers and other software (AirParrot, Duet, others). No beta use here, and I have no such software. NVRAM and SMC resets have changed nothing. Anyone have any thoughts as to what I may be missing?