SMB share with Win10

i started a new job a few months ago and i enharited a TrueNAS Scale setup. there is a share that maybe 9ish users access which is shared out via SMB from the TruenNAS device. all of a sudden, 2 weeks ago it started popping a windows auth box. seems to be random who and when it happens to. the SMB share mostly leverages connected windows AD accounts. the AD Service connection says healthy and when i do a “midclt call smb.status AUTH_LOG | jq” it returns logs. i can even query the groups via getent and/or wbinfo. im at a loss. could anyone point me in the right direction?

as a side not - i think its worth mentioning that the users who are having this specific issue are comming from the same vlan.

forgot to mention that the auth box wont accept the users windows passwords. says invalid creds. no matter if i do domain\username or username@domain.local