Speed Sensor 2 measurements stopped early


I bought a new speed sensor 2 and mounted it on the rear wheel.

By now I used it 5 times. In 2 of 5 rides (10 km) it did not record the whole tour. It actually stopped recording after 0.15 km and 0.43 km. 

Version is v4.10.

Is there something I can do to fix it? Are there others having similar issues?

Best regards