No engine after transition dolphin vtol

hi,
my set up : fc pixhawk 4
esc 4 in 1 55 amps
engine brother hobby avenger 2806,5 1300 kv
propeller 6x4x3

my problem : from qloiter to qrtl , the airplane goes to transition and when the transition is done the engines stops , to save the plane i must go to qloiter . the rc in is 1360 the rc out 1000 ; would you like to take a look at the log ? thanks