Unexpected maximum volume

after I add Google assist to my Sonos (2 x one + playbar), system unexpectedly turn volume to maximum. After I turn volume down, system several times bring volume to maximum. I’m sure it wasn’t someones mistake or joke. The same situation repeated today - but unfortunately with only small kids and grandma, without ability to turn it off 😕
I lock max volume to 50% as temporary prevention, but I’m hope your looking for better solution for this problem.

Diagnostic data: 166801522

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