F5 with 2x10g interfaces in lacp vpc with Nexus Switches

Any tips on getting this working.

Configured a pretty much standard vpc across two switches and it goes up and down like a yoyo and eventually seems to crash the f5 after 24hours.

Can not configure lacp i guess but seems a bit weird it dosen't work with nexus switches which are common as mud these days.

Any tips or config items that might be required?