I saw some post with similar subject but let me show this problem with attached screenshot.
Sometimes speed for drifting vessels "jumping" to impossible values.
Also same frequent problem with positions which are "jumping" for miles to the areas where vessels could not be situated at present moment.
Also this is confirmed to be not a "AIS signal absence" because I can see this vessels onboard using ECDIS. Could be some kind of bug of signal descrypting.
There are 3 examples for diffirents vessels.
UPDATED with one more example same time wrong position & speed
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