recvfrom: connection refused

I have a problem with my Syncthing I get an error where it keeps trying over and over to send a file, it only stops if I delete the file, let it finish syncing and possibly pack the file, then it will usually sync, it can sync multiple files and then suddenly there is one it won’t send I’m running Unraid, I’ve tried switching from Bridge mode to Host mode, that doesn’t help either

2025-02-19 14:18:52 Failed to acquire [::]:22000/TCP open port on NAT-PMP@192.168.10.1: getting new lease on NAT-PMP@192.168.10.1 (external port 63688 → internal port 22000): read udp 192.168.10.35:52232->192.168.10.1:5351: recvfrom: connection refused

it keeps writing this error until I delete the file and let it finish syncing It has been working for over 6 months, but it started doing this within 3 weeks I haven’t changed anything

No idea really without actual logs or screenshots of the failure, but I’m pretty sure deleting the file and any network errors are quite unrelated.