Just wanted to chime in with a potential solution. I started experiencing this issue yesterday and it was driving me nuts. It seemed to come from nowhere, and nothing I tried would resolve it. I scoured the internet for advice and never found a solution, but I did notice several of the threads mentioned a mounted disk for the Plex library. My ubuntu server mounts a Synology NAS via NFS for library storage. I took a look at my NFS settings and made some changes that seem to have fixed this issue for me.
Initially I had this line in /etc/fstab
x.x.x.x:/volume1/media /mnt/nfs/media nfs rw,soft,intr,user,rsize=4194304,wsize=4194304,timeo=14,vers=4
I had set that up with “rsize” and “wsize” based on a recommendation I read on some forum somewhere, which supposedly made the NFS faster.
I decided to remove the “rsize”, “wsize” and “timeo”. I also realized I was missing the “0 0” that is supposed to be at the end. So now, my /etc/fstab entry looks like:
x.x.x.x:/volume1/Media /mnt/nfs/media nfs rw,soft,intr,user,vers=4 0 0
I rebooted, and now recordings work! I had rebooted half a dozen times beforehand and recordings hadn’t fixed themselves, so while possible that the reboot randomly fixed it, I think it has to be related to the nfs settings. I’ve also noticed a few less issues as well, my Nvidia Shield would randomly stop playback of non-tv content, which no longer seems to happen.
Anyway, I don’t fully understand the NFS settings to know how that may have helped, but something to try!