El Mac apaga la fuente de alimentación cuando duerme

Mando mi portátil a dormir ( -> Sleep) y cuando lo abro después, empieza a cargar el sistema desde el principio como si lo hubiera apagado. Pierdo el progreso en mi trabajo debido a esto.
No he encontrado dónde puedo desactivar este comportamiento en la configuración. Esto comenzó hace unas semanas (después de la actualización del sistema, supongo).

¿Hay alguna forma de arreglarlo?

MacOS 10.13.4 (17E202)
MacBook Pro (15 pulgadas, 2016)

EDITAR

log show --style syslog --predicate 'eventMessage contains "shutdown cause"'
Filtering the log data using "eventMessage CONTAINS "shutdown cause""
Skipping info and debug messages, pass --info and/or --debug to include.
Timestamp                       (process)[PID]
2018-04-15 08:51:07.711622+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-04-15 21:10:28.630796+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-04-16 11:17:11.904271+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-04-16 22:55:42.824319+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-04-17 11:11:09.854747+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-04-23 22:13:08.794049+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-04-24 12:35:29.716396+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-04-24 23:28:13.687568+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-04-26 12:44:34.810162+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-04-28 23:35:48.521694+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-04-30 12:44:19.742698+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-05-04 09:12:50.828762+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-05-07 09:25:51.552046+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-05-08 09:34:15.499520+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-05-09 14:11:55.925660+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-05-09 22:51:10.543749+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-05-11 10:38:06.734522+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-05-12 12:20:26.007011+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-05-12 18:47:26.901257+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-05-13 10:35:58.837702+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-05-13 21:56:02.764590+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-05-14 11:15:37.522934+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5
2018-05-16 14:27:42.723753+0300  localhost kernel[0]: (AppleSMC) Previous shutdown cause: 5

EDITAR 2

Mis acciones después del día de trabajo:
- desenchufar el cable de alimentación del portátil
- hacer clic para dormir ( -> Dormir)
- cerrar la tapa del portátil

El portátil se apaga no porque la batería esté baja en modo de reposo, lo he comprobado (después de dormir la batería siempre está al 80%).

EDITAR 3

Battery Information:

  Model Information:
  Serial Number:    D867074D0YRHDWCAX
  Manufacturer: SMP
  Device Name:  bq20z451
  Pack Lot Code:    0
  PCB Lot Code: 0
  Firmware Version: 702
  Hardware Revision:    1
  Cell Revision:    3925
  Charge Information:
  Charge Remaining (mAh):   6345
  Fully Charged:    Yes
  Charging: No
  Full Charge Capacity (mAh):   6606
  Health Information:
  Cycle Count:  33
  Condition:    Normal
  Battery Installed:    Yes
  Amperage (mA):    0
  Voltage (mV): 12815

System Power Settings:

  AC Power:
  System Sleep Timer (Minutes): 0
  Disk Sleep Timer (Minutes):   10
  Display Sleep Timer (Minutes):    10
  Wake on AC Change:    No
  Wake on Clamshell Open:   Yes
  Wake on LAN:  Yes
  AutoPowerOff Delay:   28800
  AutoPowerOff Enabled: 1
  Current Power Source: Yes
  DarkWakeBackgroundTasks:  1
  Display Sleep Uses Dim:   Yes
  GPUSwitch:    2
  Hibernate Mode:   3
  PrioritizeNetworkReachabilityOverSleep:   0
  Standby Delay:    10800
  Standby Enabled:  1
  TCPKeepAlivePref: 1
  Battery Power:
  System Sleep Timer (Minutes): 1
  Disk Sleep Timer (Minutes):   10
  Display Sleep Timer (Minutes):    2
  Wake on AC Change:    No
  Wake on Clamshell Open:   Yes
  AutoPowerOff Delay:   28800
  AutoPowerOff Enabled: 1
  DarkWakeBackgroundTasks:  0
  Display Sleep Uses Dim:   Yes
  GPUSwitch:    2
  Hibernate Mode:   3
  Reduce Brightness:    Yes
  Standby Delay:    10800
  Standby Enabled:  1
  TCPKeepAlivePref: 1

Hardware Configuration:

  UPS Installed:    No

AC Charger Information:

  Connected:    Yes
  Wattage (W):  55
  Charging: No