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I have a "COSC-certified" (Doxa) Sub 300 with I believe to be the SW200-1 (made in 2025). I bought it from a fellow WUSer when it was essentially new. I have observed the following:
1. It ran within COSC (like +1-2 spd) for a week or two after I got it.
2. It suddenly started running fast, like +7 spd.
3. I regulated it back to +1-2 spd.
4. It ran like that for a few days, then started running slow.
5. I regulated it again, back to 1-2 spd.
6. It ran at 1-2 spd for a few days, then started…
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