@nebutech
Your miner works on C29 for a few minutes then forces my rig to switch to Cuckarood29 although the fork hasn't yet happened!!
:-(

Did you use config file to start?

Try add

"grin29-fork-height": 262080,

to the json file.

Or start with cmdline options.

Had this same issue on HiveOS. Added this to the Extra config arguments - "grin29-fork-height": 262080
Its working fine now,

Thanks

Will add a option to auto generate a json file in future versions.

SERO

6x1080Ti

G4400 CPU load 100%

Win 10, 4GB RAM

Can you be more specific?

A screenshot with both Miner cmd windows and task manager windows will be good help.