Issue with match-making in ranked (Plat elo)

So basically its getting to the end of season where almost everyone queues up for ranked and grinds for the elo/rrewards etc. Now I (and I dont know if its only me) for the past 5 games have had an issue of match-making. Being in plat ive been playing with/against diamonds, plats and the occasional but rare masters. But NOW for some god dam reason out of no where Im now being matched with silver 1/ gold and have now demoted ( though still in plat) Help!??!
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