I have a really weird issue with my first Win 10 domain

All of my clients have joined the domain after I did the following registry changes

[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanManWorkstation\Parameters]

"DomainCompatibilityMode"=dword:00000001
"DNSNameResolutionRequired"=dword:00000000

I also added - max protocol = NT1 to my smb.conf file

Everything works great considering its a full SSD network, really fantastic performance

I just have one issue, on most of the workstations when I try to login (romain profiles enabled ) I get the following message intermittently

"There was a problem with your roaming profile you've been signed in with your previously saved local profile"

This happens roughly 3 times out of 5 logins. the other attempts are fine

Has anyone seen this issue, or any ideas!

Thanks in advance