New RIG instability issues

We are running a rig with 6 cards on asrock h110 in hive os - 1x3060ti, 4x3060 and 5700xt. It was all working fine but all of a sudden the hashrate has halved and power consumption has decreased. Fans currently ay 70% and temps around 50c. Have used splitter cables to power risers and gpu’s. Would separate cables for each riser and gpu bring stability?

Now every time it is restarted the hashrate does not increase