Change exposure every frame

Is it possible, using the script node, to change exposure every frame? I'm running the following script on an OAK D W POE, but I'm seeing irregular results, with exposure changes happening at intervals of between 1 and 6 frames.
import time
ctrl = CameraControl()
normal = True
while True:
if normal:
ctrl.setManualExposure(5000, 3200)
normal = False
else:
ctrl.setManualExposure(1500, 3200)
normal = True
node.io['ctrl'].send(ctrl)
time.sleep(1/15)

Thanks,
Will