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ETA II : Reset SMC, problem seems to be solved, though my FileVault was disabled.

ETA: I did as @Allan suggested and got this:

Timestamp Ty Process[PID:TID] 2020-05-14 04:45:06.022 Df kernel[0:a9] (AppleSMC) Previous shutdown cause: -104

I did as @Allan suggested in comments and got this:

Timestamp               Ty Process[PID:TID]
2020-05-14 04:45:06.022 Df kernel[0:a9] (AppleSMC) Previous shutdown cause: -104

ETA: I did as @Allan suggested and got this:

Timestamp Ty Process[PID:TID] 2020-05-14 04:45:06.022 Df kernel[0:a9] (AppleSMC) Previous shutdown cause: -104

So does this mean reset SMC?