JY-VQ130N4GN does not start or late Golf Plus

I have the JY-VQ130N4GN Joying 8 inch Volkswagen Head Unit 4GB+64GB Android 10.0 GPS Navigation with DSP in my 2012 Golf Plus.

Radio was working like a charm.

Since 1 - 2 weeks the radio does not start with ignition anymore. Sometimes it does not start in 30 min, sometimes it starts after 10 - 20 min.

Did someone else had a similiar problem?`
As it sometimes starts it can not be the car fuse. Does the Radio have one?

Also 12v is there all the time. Battery of the car is 6 months old.

The Radio was bought in May.