Occasional unexplained switch between SD card and phone storage

On Samsung S9 with Android 10:
I normally record without problems on SD card. On two occasions recently I found single “missing” sequences on the built-in phone memory. I am sure that I did not touch anything on the phone or app settings, riding on my bike. The misplaced sequences were in both cases in the middle of the recordings, in the sense that the sequence before and the sequence after went correctly to the SD card. I did not notice any warning or other strange behaviour.
I have so far taken > 1.5million Mapillary photos an two different Sony phones and now on this S9, mostly using SD card storage - never seen anything like that.

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The SD card may have temporarily lost contact to the phone because of vibrations. Just the ground pin loosing contact for a short period of time is enough to basically signal a dismount to the device. In my experience, some Samsung phones are prone to this, especially older ones. The same applies to SIM cards. I am not saying that Samsung phones might be of poor quality. It is just that smartphones are neither designed nor made for outdoor offroad applications. They are designed for pockets and hand bags.

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