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Hi and welcome to the forum.
It sounds to me like you might have a hard to see crack, possibly around the drain area where they seem to be most common.
Although it could be anywhere on the bottom of the tub. Close inspection is needed. It is also possible the drain is coming loose, I'd check that first.
DM
It sounds to me like you might have a hard to see crack, possibly around the drain area where they seem to be most common.
Although it could be anywhere on the bottom of the tub. Close inspection is needed. It is also possible the drain is coming loose, I'd check that first.
DM
