When a fill valve opens up from time to time to let more water in it is because the rubber flapper is not sealing properly and is allowing water to slowly seep out.
Toto Caryles have a 5 year parts warranty so keep this in mind if ti applies. If replacing the flapper doesn't solve the seepage problem then the flush valve (the white assembly the flapper connects to) may have to be replaced.
Be sure to install the new flapper at the exact chain length as the one you removed.
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