Picture Stuttering on resumed playback

I recently upgraded my storage to a Terramaster D4-320, with a 12TB Seagate Ironwolf HDD installed. This is directly plugged into my router (Asus XT9), and most of the time watched via an AppleTV 4K latest version. Historically I just had a few Samsung T9 SSD’s plugged in the same way. I have started to experience a lot of issues with playback when a file is resumed later in the day/over different days. Audio is fine, but picture will freeze, play for a few seconds, freeze again. Not just on higher quality files, but also 1080p stuff. Question is, is there anything I can do to fix it? I researched a fair amount and the drive enclosure and HDD itself seemed to be more than adequate. The fact that it works fine on a freshly started file shows no bandwidth issues. My thought is maybe the fact is it formatted as a Mac OS Journaled drive, rather than NTFS might come into play? Just wanting to see if anyone else has suffered similar of can offer any suggestions. TIA

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What protocol are you using? SMB, FTP, UPnP, etc

SMB. Only method I r seem to have got working. Up till Now never had this issue with the set up

You may want to set it to SMB2 and see if that helps.

tried it with SMB2, no difference. also tried a new USB cable to connect to router and no joy.

Could you run a speed test and post the results here with a screen cap of the graph? It’s best to let the test complete for one of the files that is showing this issue.