Temperature issue on develop version

I've flashed the developer version. I own a Gardena R70li and would like to give it a trail. It works quite good, however the temperature measurement seems buggy. I've got several times temperatures around zero degrees, and a bit later around 20 degrees. Both without error in the log message window.

Oh, just now I've got an error message, at that time the temperature jumps from 25.x to 0.2 degrees.

13.05.2020 19:37:45 Invalid response (STATUS 02-12-01-01-9F-03 -> timeout1)

13.05.2020 19:37:45 Invalid response (AUTO 02-0E-01-04-51-03 -> B5-03-02-0F-03-00-00)