Dramatically drops hashrate on 1080ti

[wax]

Time.Started.....: Thu Jan 28 07:10:48 2021 (13 secs)
Speed.#1.........:    47662 H/s (71.05ms) @ Accel:2 Loops:1024 Thr:1024 Vec:1
-----------
Time.Started.....: Thu Jan 28 07:10:48 2021 (4 mins, 20 secs)
Speed.#1.........:    40458 H/s (73.58ms) @ Accel:2 Loops:1024 Thr:1024 Vec:1
--
Time.Started.....: Thu Jan 28 07:10:48 2021 (5 mins, 17 secs)
Speed.#1.........:    34842 H/s (76.64ms) @ Accel:2 Loops:1024 Thr:1024 Vec:1
--
Time.Started.....: Thu Jan 28 07:10:48 2021 (9 mins, 19 secs)
Speed.#1.........:    23854 H/s (74.21ms) @ Accel:2 Loops:1024 Thr:1024 Vec:1
--
Time.Started.....: Thu Jan 28 09:54:07 2021 (2 hours, 19 mins)
Speed.#1.........:    14530 H/s (63.30ms) @ Accel:2 Loops:1024 Thr:1024 Vec:1

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MD5 for prof of stable performance.
Time.Started.....: Thu Jan 28 12:23:32 2021 (20 secs)
Speed.#1.........: 13031.9 MH/s (33.15ms) @ Accel:32 Loops:256 Thr:1024 Vec:1
--
Time.Started.....: Thu Jan 28 12:23:32 2021 (8 mins, 5 secs)
Speed.#1.........: 13129.0 MH/s (30.53ms) @ Accel:32 Loops:256 Thr:1024 Vec:1