It turns out that the self-levelling screed that had been used 6 years ago hadn't been given enough time to dy out (about 3 days, needed 2 weeks minimum), so there's been moisture trying to work its way out ever since.
So, had to do some repairs to the screed, and it's been drying out for about 10 days now (with a dehumidifier). We'll see ....
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