[QLDs4]

Tried the black and red key, by the way.

Have you used the red key recently before your issue appeared?

 

[QLDs4]

I was just wondering if you had erased the black key from the immobilizers memory.
If you hadn't used the red key in ages it shouldn't be that.

 

[QLDs4]

Do you have an instruction how to override the key with the electronic code or maybe an instruction how to program the keys again? There a total lack of information about this at the st4s.

This for the S4 monster, not sure if it will help you or not.

 

[QLDs4]

Well, that came out like rubbish.

 

[QLDs4]

I'v heard a mechanic once say the overhead powerlines next to a garden disrupted the immobilizer of a bike

The 2 times mine played up I had just fueled up, at the same servo both times.
It's a newish servo with screens playing ads on the bowsers.
Maybe they run on Bluetooth or WiFi?