I had simialr issue when using LACP and CISCO switches with 10Gb conenctivity.
Some could acess and some could not access the shares, was toptally random who could conenct
We had to disable the optiosn ip.fastpath and bang problem solved, this was 7-mode but now I do this as matetr of course on all cDOT installs as well just in case, it seems to be an unknown-know issue.
Might not be relevant but instant to chnage and chnage back.