Hello Twinjax, that 10-day watering interval is way too long. This plant is quite tropical, and not to be grown like a desert cacti. It prefers a moist media, but not soggy, it still has to be allowed to drain out excess water. I have never used moisture meters. I just observe how the leaves go. I grow my Peace Lily indoors and when it gets cooler, then add another day or so interval since light levels that comes in now are getting even shorter. During summer here, it is really thirsty.
It is good to know your plant is not in direct sun
But nevertheless, depending on what brightness your plant gets and ambient temps around it , that will also determine how fast it will consume its moisture.
Try to improve and adjust your watering. Especially if you are already running your indoor heaters, dry out time will be faster. Also do understand the older leaves are the first to go, so if those wilting ones are the older ones, then it is nothing to worry about. As long as new leaf growth still comes out from the center, then your plant is still doing generally okay.