The issue symptoms have been described in the following bug report for OpenWrt: https://bugs.openwrt.org/index.php?do=details&task_id=762
This seems to be a fix for the issue: https://github.com/openwrt/openwrt/commit/d40a358136fdc19e6af13921867ed93444c08827
My TL-WR1043ND v4 has the same symptoms with latest libreCMC v1.4.5. Connection type is pppoe, and my ISP has 1 Gbit/s UP/DN link.
To reproduce, just try to download some very popular torrent, like latest Ubuntu ISO. What's interesting, is that when the speed is throttled down to about 40~100 Mbit/s (I guess my ISP does that during peak usage times), the issue is harder to reproduce.
I checked out the libreCMC and also OpenWrt (at tags v17.01.6 and v18.06.1) repositories locally. Both OpenWrt ones look like the patch is applied, while it's missing in libreCMC for some reason.
Can you confirm if this issue has been fixed in the newer v1.4.6 images?
I cannot reproduce the issue anymore for any of the workloads which were failing before the upgrade.
Did the sysupgrade using the https://librecmc.org/librecmc/downloads/snapshots/v1.4.6/ar71xx/generic/librecmc-ar71xx-generic-tl-wr1043nd-v4-squashfs-sysupgrade.bin
Thank you very much!
Thank you for filing an issue. Please reopen this if there is a similar bug in the future.