WireGuard Congestions the network

Hi, friends, after having purchased for almost a month and made several attempts with settings and firmware, I still cannot get my AR750S’s wireguard network to work well, once started after a few hours or minutes the traffic goes into congestion, so particular the block concerns the “ListenPort”, when the network is blocked I have to manually update this port and at that point the wireguard network traffic returns to work.

I tried with LUCI to configure everything so that it can work, I reset the firmware several times, currently I use the relase 3.104 (2020-04-27 17:57:57).

Can anyone tell me what trick I can follow to make my wireguard network work well?

Open WireGuard directly after RESET firmware, same problem?