Question Graphics card FPS drop after about a week

Aug 18, 2019
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About 2 weeks ago I bought a Saphire pulse RX 590 and it was running fine for about a week, until i was suddenly getting lower clock speeds to 900-1100 from over 1500. I fixed the issue by using global Wattman and i am now getting over 1500mhz, but my FPS didn't change. Any help? Thanks.
I am using the latest driver software