2020.06.09:11:34:45.506: GPU1 GPU1: Free VRAM: 3.948 GB; used: 0.052 GB <---------
2020.06.09:11:34:45.506: GPU1 GPU1: Allocating DAG for epoch #341 (3.66) GB
2020.06.09:11:34:45.510: GPU1 GPU1: Generating DAG for epoch #341
You obviously can't mine at epoch 351 with the 4GB card that is connected with the monitor
because there isn't enough VRAM for both activities. Just exclude it from mining: -gpus 23456 . Remove also your first gt: -gt 26,27,25,25,24
You can run second instance of PM to mine ETH with the first card. Use the same command line parameters, just change the pool with ETH pool (e.g.: -pool ssl://eu1.ethermine.org:5555), change wallet with some ETH wallet (e.g.: -wal 0x...SOME...ETH...WALLET...) and set -gpus 1 -gt 25 for the second instance of PM.