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FGBS-222 with DS18B20 temperature stable then varies dramatically

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    FGBS-222 with DS18B20 temperature stable then varies dramatically

    It sounds like a number of people have an FGBS-222 with a DS18B20 temperature probe.

    When I connect these to my HS3 software running on a ZeeS2 device, the temperature reads great (within a degree of other devices), but if I leave it for a few hours and check again, it reads a wildly higher value (current temp is around 67F and it reports 83F-88F).

    If I wait a while and check again it is back to the right value and back and forth.

    To narrow down the issue I've tried:
    - 2 different power sources: 9v @ 9mAh & 12v @ 2.1A - 2 different FGBS-222 units (1 from Amazon, 1 from Newegg)
    - 2 different temperature probes (Amazon and Newegg again, look the same but have different colored wires)
    - stripped extra wire to get a secure connection (power -> FGBS-222 -> DS18B20) and taped up
    - placed indoors in the corner of a room to prevent disturbance

    Has anyone else seen something like this?
    The only thing I don't have two of is ZeeS2 devices, so wondering if it's a problem with that or the HS3 software maybe?