Sync never finishes for some files

[dee]

I have a few files which are never synced. Sometimes 1 or 2 files are synced after restarting Sync on my Linux (Ubuntu 16.04) notebook. The startup of the service takes very long, 1-2 minutes and the log is full of:

[20200131 17:10:11.282] TF[3D12] [0x00007fbe90741110][/home/mober/Resilio Sync/sync/sources/fonts/JetBrainsMono-1.0.0/JetBrainsMono-ExtraBold-Italic.ttf]: state:DOWNLOAD error: meta:1 conns:0 io:5 disk:100% mt:0% net: 0%
[20200131 17:10:11.282] TF[3D12] [0x00007fbe90741110][/home/mober/Resilio Sync/sync/sources/fonts/JetBrainsMono-1.0.0/JetBrainsMono-ExtraBold-Italic.ttf]: unloading torrent by timeout
[20200131 17:10:11.282] TC: Force unloading torrent /home/mober/Resilio Sync/sync/sources/fonts/JetBrainsMono-1.0.0/JetBrainsMono-ExtraBold-Italic.ttf
[20200131 17:10:11.282] TF[3D12] [0x00007fbe90741110][/home/mober/Resilio Sync/sync/sources/fonts/JetBrainsMono-1.0.0/JetBrainsMono-ExtraBold-Italic.ttf]: check can delete: fs_refs = 5
[20200131 17:10:11.282] TF[3D12] [0x00007fbe9073d600][/home/mober/Resilio Sync/sync/sources/fonts/JetBrainsMono-1.0.0/JetBrainsMono-Italic.ttf]: state:DOWNLOAD error: meta:1 conns:0 io:5 disk:100% mt:0% net: 0%
[20200131 17:10:11.282] TF[3D12] [0x00007fbe9073d600][/home/mober/Resilio Sync/sync/sources/fonts/JetBrainsMono-1.0.0/JetBrainsMono-Italic.ttf]: unloading torrent by timeout
[20200131 17:10:11.282] TC: Force unloading torrent /home/mober/Resilio Sync/sync/sources/fonts/JetBrainsMono-1.0.0/JetBrainsMono-Italic.ttf
[20200131 17:10:11.282] TF[3D12] [0x00007fbe9073d600][/home/mober/Resilio Sync/sync/sources/fonts/JetBrainsMono-1.0.0/JetBrainsMono-Italic.ttf]: check can delete: fs_refs = 5

What is wrong here? 

[AlexC]

@dee could you please send us full logs and mention the names of the files?