Greeniis, try letting the plant dry out before you repot. Peace lilies also like to be root bound.
My peace lily
needs very little water, when I did water mine too much my leaves were brown tipped as well and now with less water they don't go brown on me so easily. I wait with my water till my plant looks like it wants to wilt on me.
By the way welcome to a great forum, keep coming back you'll love it here.