Pi 4 external HDD loading 4k videos really slow on xfs and ext4 (ntfs worked fine)

Hi guys, I have a 4tb external hard drive from Seagate that I use for steaming (jellyfin). Previously the hard drive was in ntfs format which loaded all 4k videos directly with no problems, even fast forwarding there were no problems. Unfortunately I had the problem that copying files via samba took forever 20-30mb/s but now with xfs I get a constant 110mb/s Unfortunately I now have the problem that all the videos I play just take forever to load, strangely the videos all start immediately but as soon as you watch 20-30 seconds further the hard disk just stops reading? and it only continues after 1 minute. i checked the hard disk with iotop and found that nothing happens after fast forwarding, nothing is read, just dead silence. nothing happens with top either, not much cpu usage. Do you have any ideas?