No problem for this help, thats why this page exists.
Back to your problem:
You see what I mean, they change (expensive) parts for nothing, only for the reason they THINK it could be the suspicious device.
Your problem is really strange because your car suddenly stopps. From this distance its hard to make a reliable diagnosis. Do you have a protocol of the fault recorder? I hope you know what I mena, I am not sure if this is the right translation for "Fehlerspeicher". What I mean is that you can connect your car with a computer. Then you can see all the faults which occured during the last time. Maybe you can find an indication...
Can you repair your car on your own? I guess not... ;))
With the marten, I think it is just a possibility you should think about. Just take a look in the engine compartment and watch out for any traces of this cute but annoying animal.
Your error which occurs as a random failure might be a short circuit...you should have a look at the fault recorder which I told you about at the beginning. Then you should post it here or send me to my email...
Dont worry about your German, its good enough.