Just to chime in here as having some of the same problems. I have a 2014 S (P85D) and just had her into the service center to replace per the recall as prompted by the NTSB:
MSX VCM, MCU, TEGRA
DAUGHTER BOARD REV-B/C -
PROVISIONED (64 GB) -
REMANUFACTURED(2728212-
S0-B)
It could be the...