I purchased 39.5mm Planet Ocean 600m with the 8800 movement last month and noticed it was losing about 1.5 seconds per day. Like you, I was under the assumption that a METAS movement shouldn't lose any time at all, so I was really disappointed by this. I particularly hate it when my watches lose time, rather than gain, since losing means that you can't just simply 'hack' the seconds to reset it to real time; I'd honestly prefer for a watch to gain upwards of 5 seconds/day over losing even just .5 seconds.
Since mine is under warranty, I decided to send it to my nearest Swatch service center in Culver City last week with the request that it be regulated within the METAS specs to no longer lose time. I noted that I had tracked the time myself over the past few weeks, and even had my local watchmaker verify that it is running slow. I'm following the progress on the customer service info portal (pretty neat!) and the latest update is that 'a partial service is required to adjust the timing of your watch' and that it is 'waiting for parts' for 'water resistance service'. Seems unnecessary but I definitely don't mind them popping in some fresh gaskets and verifying the water resistance, as long as they regulate it as well.
Got my fingers crossed that they'll be able to speed it up a bit... should be back before February and I'm happy to give you an update if you're curious on how it goes.
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