Wifi connected but no internet

[woronet]

my headunit:
typ: CN10-01202B-01B
Prozessor: QuadCore-T3
Android-Version: Android 6.0.1
MCU-Version: T5.3.19-11-0F-453101-170822
System-Version: V8.2.3_20170905.143711_KED3-5

my problem:

Wifi: "No internet Access Detected, won't automatically reconnect'

Status: Connected, no Internet
Signal strength: Fair
Link Speed: 72 Mbps
Frequenzy: 2,4 GHz

although the message 'no Internet' appears, I can access all websites but I have to manually set up the wifi connection every time I start it.
There is no difference whether I connect to a mobile router or to a hotspot on the mobile phone

Resetting to factory settings did not solve the problem

I think I'll have to re-upload the firmware, but I can't find it anywhere to download

Ist there anybody out there, who can help me?

Thanks in advance for help

[Jammy]

Hello
Thanks for your message
Is there any problem with Bluetooth and radio?
Does it have memory on other functions?
Best Regards
Autopumpkin

[woronet]

There is no Problem with Bluetooth.
Naviceiver works fine in all functions ... except for the problem described
I installed 'Sygic Truck' to navigate, but cannot update maps due to the error. When downloading, the connection closes after approx. 500 MB
... and ... 'Sygic' does not recognize downloaded maps

[Jammy]

Hello
Thanks for your message
Is it possible to send us a video about the problem?
Best Regards
Autopumpkin