Tracker HTTP response 0 (No Response) in Transmission 4.0.3

Hi, i was happy user of Transmission 4.0.3 on my Synology 923+ for long time, since two image updates ago. Before i had 8000+ active torrents and no single error with seeding or downloading.

Now i get alot of Tracker HTTP response 0 (No Response) on both downloads and seeding torrents. Also many downloading torrent hangs for few hours with Idle status. Im using private tracker and torrents work fine in other client.

Ports are open and i haven’t change any settings. Only updated the image.

Any suggestions ?