"Aggressive Wi-Fi to Mobile data handover" developer option toggles itself off on reboot

[Thwomp]

Hi there, I have been experiencing the behaviour in the subject line since installing the Marshmallow firmware upgrade. Is there any way to stop this from happening? Firmware version is 23.5.A.0.575.

[Thwomp]

It is a shame, though, as this is a useful feature...