2070 Super suddenly only 15MHs

The card is running for a few month and until recently it did around 40MHs. But now it only does 15MHs no matter what i do.

I am running HiveOS. My Rig consists of:
1x 2070 Super (T-Rex Miner)
5x rx 470 (teamredminer)
2x 5700xt (teamredminer)

What i tried:
Different minder
Update nvidia drivers
different VBios
changed riser

nothing helps.

Is the card dead? Thanks for your help.

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