Le Mac éteint l'alimentation électrique lorsqu'il dort

J'envoie mon ordinateur portable en veille ( -> Sleep) et quand je l'ouvre plus tard, il commence à charger le système depuis le début comme si je l'avais éteint. Je perds la progression de mon travail à cause de cela.
Je ne trouve pas où je peux désactiver ce comportement dans les paramètres. Cela a commencé il y a quelques semaines (après la mise à jour du système, je suppose).

Y a-t-il un moyen de le réparer ?

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

EDIT

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

Mes actions après la journée de travail :
- débrancher le câble d'alimentation de l'ordinateur portable
- cliquer pour dormir ( -> Sleep)
- fermeture du couvercle de l'ordinateur portable

L'ordinateur portable s'éteint non pas parce que la batterie est faible en mode sommeil, je l'ai vérifié (après le sommeil la batterie est toujours au moins à 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