I fully formatted the sd cards of the baikals, then restored it with the new software https://drive.google.com/drive/folders/1Guf6L8Zd6IXcmPHKxA_oTHo6p1QJovtU?usp=sharing (from the baikal site)
Also configured a static i.p. address for each baikal with Baikal miner ip configurator, and they are running ok now. Still sometimes have to restart one. But since i gave them a static ip, i have less problems.