[2020-12-12 18:37:57] Pool eu-01.miningrigrentals.com received new job. (job_id: 0x3bef404a660..., diff 0.250 / 1074 MH)
[2020-12-12 18:37:57] Pool eu-01.miningrigrentals.com share rejected. (GPU3) Error code: 23 - Low difficulty (a:126 r:1u) (356 ms) (diff 4.98 GH)
What is this error? i see this error every 2-3 hour and reject
miner is stable and work fine 3-4 days but have 1% reject
other ring identical. work fine but 1% reject for error code 23
Pretty high accept roundtrip time on that share, looks like a Nicehash reject as well. Is this a rental period or are you falling back to Nicehash between rentals? Nicehash are horrible with their reject policy, they pump out jobs and reject anything for "old" jobs from 200ms ago. You can see that you just received a new job right before the share was rejected, so my guess is simply that the share was for the prev job, and the underlying pool (Nicehash or not) rejects it.