during the last 5 flights with my Pixhawk powered Skywalker 1900 I started to get some weird periodical voltage oscillations. Those oscillations occur rather regularly throughout the flight and then stop again.
Normally my amplitude of highly frequent voltage change is in the range of 0.2 volts. Then, all of a sudden (and without applying more throttle) the amplitude changes to > 1 volt. This lasts for about 30 seconds, then goes back to the normal .2 volts amplitude. Then its fine again for a couple of minutes, until it starts over again. When the unnormal oscillations begin, this also affects servo rail voltage and board voltage, so I am a little worried of a brownout.
Has anybody an idea what the problem could be? I would be happy for some advice. My APM.Plane version is 3.3.
The log file can be downloaded here:
file-upload.net/download-109 … 5.log.html