Mazda5 TMPS stopped flashing

Hello, I searched the forum and couldn't find a definitive answer, so here goes:

I have aftermarket TPMS sensors installed, the TPMS light have been always flashing ever since.
But suddenly, today the light doesn't come on anymore.
Any idea why would this happen? Not that it's a big problem, but I'm wondering, what would cause that?
 
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