I was hiking the last days and my 955 did not save the recorded tracks. A shorter track around 12 Km was successfully saved, but two tracks with 20 and 23 Km with more that 6 hours not. There was an error displayed but I could not read it. I'm still on FW 13.23. Is this a known bug that was solved in newer FW? I've not seen this in my normal run activities, but they are much shorter.