15 year old maple tree (approx. 20 ft.) with at least 5 large main roots protruding above ground (and getting worse each year) on the north side of tree which is the higher(top) part of the yard (planted in middle of sloping front yard). Beautiful tree, but not sure what to do. If I grind down or cut out the protruding roots will it cause the tree to start leaning downward towards the bottom of the front yard? Should we cut it down now before it gets bigger?