High packet loss after some time of using wireguard+udp2raw setup

Description:

I am experiencing significant packet loss after some time using the wireguard+udp2raw setup. Initially, there is no packet loss, but after a period (sometimes a few days, sometimes just an hour), packet loss starts to occur, reaching up to 50%. During this time, CPU and memory utilization remain low.When I restart the udp2raw client process, the packet loss stops temporarily, but it starts again after some time.

Previously, when using only WireGuard, I encountered tunnel interruptions specifically when transmitting HTTPS traffic. This issue was resolved by introducing udp2raw.

Expected Behavior:

The tunnel should maintain a stable connection with no packet loss.

Environment:

OS: [openwrt] cmd: client:[/usr/bin/udp2raw -c -l 127.0.0.1:1111 -r ${serverip}:1111 --raw-mode faketcp --cipher-mode xor --log-level 0 -a --wait-lock] server:[/usr/bin/udp2raw -s -l 0.0.0.0:1111 -r 127.0.0.1:1111 --raw-mode faketcp --cipher-mode xor]

Questions:

Are there any known methods to improve this situation? Could this issue be related to firewall settings, and if so, what steps can I take to investigate and resolve it?