Question Gtx 980 ti crashes under load 5-10 min/help

Jul 1, 2020
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So iam going to buy a used gtx 980 ti. Its used and havent been overclocked. The guy who is selling it says that the gpu just randomly crashed and has not been working as it should since then . Since then the gpu crashes and drops to 20 fps, even at low setings. It drops fps after 5-10min. He also says that all the other comonents works. I hope there is a easy fix since he sells it for 50$.
Thank you:)