Hardware transcoding issue

Hey,
I have pretty much the same issue on a ubuntu 20.04.5 server with a Nvidia T600 and plex version 1.30.1.6562.

My logs show these errors in repeat:
Jan 21, 2023 21:23:58.429 [0x7fcb8fe2db38] Fehler — [Req#5f2c2/Transcode/43campy4g3srk/5bbe052d-fb99-4a62-ac8e-d1f927eb4d87] [hevc @ 0x7f4dd5179740] hardware accelerator failed to decode picture
Jan 21, 2023 21:23:58.429 [0x7fcb9064eb38] Fehler — [Req#5f2c5/Transcode/43campy4g3srk/5bbe052d-fb99-4a62-ac8e-d1f927eb4d87] Error while decoding stream #0:0: Generic error in an external library
Jan 21, 2023 21:23:58.431 [0x7fcb8f053b38] Fehler — [Req#5f2c8/Transcode/43campy4g3srk/5bbe052d-fb99-4a62-ac8e-d1f927eb4d87] [hevc @ 0x7f4dd5179740] Could not find ref with POC 369
Jan 21, 2023 21:23:58.431 [0x7fcb8fe2db38] Fehler — [Req#5f2cb/Transcode/43campy4g3srk/5bbe052d-fb99-4a62-ac8e-d1f927eb4d87] [hevc @ 0x7f4dd5179740] No decoder surfaces left
Jan 21, 2023 21:23:58.431 [0x7fcb9064eb38] Fehler — [Req#5f2ce/Transcode/43campy4g3srk/5bbe052d-fb99-4a62-ac8e-d1f927eb4d87] [hevc @ 0x7f4dd5179740] decoder->cvdl->cuvidDecodePicture(decoder->decoder, &ctx->pic_params) failed → CUDA_ERROR_INVALID_VALUE: invalid argument

Somebody with an idea?

Regards
Chris