dslrdashboard.info

Using LR timelapses function with latest version of qdslrdashboard (3.5.3) with Samsung Galaxy S5Neo and a Nikon D750 the wifi connection is lost after 1-3 hours and the timelapse is screwed up. qdslrdashboard is still running, the camera as well but no wifi connection between both.
Any ideas what could be wrong?

Using qdslrdashboard on a PC the Wifi connection is stable for more than 10hrs. Hence, the Nikon Wifi is not the issue. I suspect some Android specific function that resets the Wifi connection after some time, may for saving energy. I already deactivated intelligent network change and activated WLAN on standby in Android but no improvement.
Any other ideas?