Please reset the MaxiDas App.
Home/ System Setting/ Apps/ MaxiDas/ Clear Data
If your DS808 is not solution, Then uninstall the MaxiDas App.
After the uninstall, you go to ,,,,
Home/ ES File Explorer/ Scan/ apk_back/ MaxiDas.apk
Please re install App.
After a while, you will be notified of system program updates.
Regards.