I have always added "M420 S1" to the last lines of the Startup -G-Code like this, to restore the Bed Leveling Data.
M117 My Print...
G28 X0 Y0
G1 E4.0 ;prime extruder
G92 E0 ;reset extruder length
M420 S1 ; Bed Leveling On
M220 S32.000000
;M420 V1 ; Print the leveling grid
M117 My Print...
G28 X0 Y0
G1 E4.0 ;prime extruder
G92 E0 ;reset extruder length
M420 S1 ; Bed Leveling On
M220 S32.000000
;M420 V1 ; Print the leveling grid