Found another issue.
Transfer rate between W7 Desktop to NAS was 100 MB/s.
Transfer rate between W10 Destktop to NAS is now 4 MB/s.
No changes were made to network, only difference is the "upgrade" from W7 to W10.
Annoying to say the least.
Looking for a fix.
Gonna try to reboot the whole network before I start feking with settings.
Slow network throughput on windows 10