WiFi network flaky/WireGuard connections inconsistent

[John]

I am experiencing hit-or-miss connectivity through wireguard when connected to a specific, unsecured, public WiFi from iOS devices. Meaning, I first connect to the public WiFi at which point, wireless works fine, websites load, etc. but when I subsequently initiate a wireguard connection, most of the time, the traffic flows stops due to a connectivity issue. If I fiddle with toggling the WG connection off then on several times, it eventually works.

Through searching, some suggestions about lowering the MTU value to improve stability are mentioned. I tried lowering the MTU size on the interface to 1440 and then again to 1280 but neither made a difference. Wondering if more experienced people here have some suggestions.

Here is the log from the iOS client when I attempt to connect:

2022-11-05 15:22:59.205912: [NET] App version: 1.0.15 (26)
2022-11-05 15:22:59.206042: [NET] Starting tunnel from the OS directly, rather than the app
2022-11-05 15:22:59.434059: [NET] DNS64: mapped xxx.xxx.xxx.xxx to itself.
2022-11-05 15:22:59.435425: [NET] Attaching to interface
2022-11-05 15:22:59.436179: [NET] UAPI: Updating private key
2022-11-05 15:22:59.436173: [NET] Routine: handshake worker 3 - started
2022-11-05 15:22:59.436234: [NET] Routine: decryption worker 2 - started
2022-11-05 15:22:59.436244: [NET] Routine: encryption worker 2 - started
2022-11-05 15:22:59.436489: [NET] Routine: decryption worker 3 - started
2022-11-05 15:22:59.436532: [NET] Routine: encryption worker 3 - started
2022-11-05 15:22:59.436605: [NET] Routine: handshake worker 2 - started
2022-11-05 15:22:59.436659: [NET] Routine: decryption worker 5 - started
2022-11-05 15:22:59.436793: [NET] Routine: encryption worker 1 - started
2022-11-05 15:22:59.436856: [NET] Routine: encryption worker 4 - started
2022-11-05 15:22:59.436864: [NET] UAPI: Removing all peers
2022-11-05 15:22:59.436903: [NET] Routine: decryption worker 1 - started
2022-11-05 15:22:59.436924: [NET] Routine: decryption worker 6 - started
2022-11-05 15:22:59.436940: [NET] Routine: handshake worker 6 - started
2022-11-05 15:22:59.436969: [NET] Routine: TUN reader - started
2022-11-05 15:22:59.437424: [NET] Routine: handshake worker 1 - started
2022-11-05 15:22:59.437493: [NET] Routine: decryption worker 4 - started
2022-11-05 15:22:59.437554: [NET] Routine: encryption worker 5 - started
2022-11-05 15:22:59.437553: [NET] peer(fTiT…qSc) - UAPI: Created
2022-11-05 15:22:59.437572: [NET] Routine: handshake worker 4 - started
2022-11-05 15:22:59.437610: [NET] Routine: handshake worker 5 - started
2022-11-05 15:22:59.437654: [NET] Routine: encryption worker 6 - started
2022-11-05 15:22:59.437674: [NET] peer(fTiT…qSc) - UAPI: Updating preshared key
2022-11-05 15:22:59.437755: [NET] Routine: event worker - started
2022-11-05 15:22:59.437901: [NET] peer(fTiT…qSc) - UAPI: Updating endpoint
2022-11-05 15:22:59.438089: [NET] peer(fTiT…qSc) - UAPI: Updating persistent keepalive interval
2022-11-05 15:22:59.438175: [NET] peer(fTiT…qSc) - UAPI: Removing all allowedips
2022-11-05 15:22:59.438303: [NET] peer(fTiT…qSc) - UAPI: Adding allowedip
2022-11-05 15:22:59.438818: [NET] UDP bind has been updated
2022-11-05 15:22:59.438848: [NET] Routine: receive incoming v4 - started
2022-11-05 15:22:59.438881: [NET] Routine: receive incoming v6 - started
2022-11-05 15:22:59.438909: [NET] peer(fTiT…qSc) - Starting
2022-11-05 15:22:59.439099: [NET] Interface state was Down, requested Up, now Up
2022-11-05 15:22:59.439187: [NET] Device started
2022-11-05 15:22:59.439263: [NET] peer(fTiT…qSc) - Routine: sequential receiver - started
2022-11-05 15:22:59.439307: [NET] peer(fTiT…qSc) - Routine: sequential sender - started
2022-11-05 15:22:59.439450: [NET] Tunnel interface is utun3
2022-11-05 15:22:59.440162: [NET] Network change detected with satisfied route and interface order [en0, pdp_ip0]
2022-11-05 15:22:59.440584: [NET] DNS64: mapped xxx.xxx.xxx.xxx to itself.
2022-11-05 15:22:59.440704: [NET] peer(fTiT…qSc) - UAPI: Updating endpoint
2022-11-05 15:22:59.440914: [NET] Routine: receive incoming v4 - stopped
2022-11-05 15:22:59.440962: [NET] Routine: receive incoming v6 - stopped
2022-11-05 15:22:59.441407: [NET] UDP bind has been updated
2022-11-05 15:22:59.441437: [NET] Routine: receive incoming v4 - started
2022-11-05 15:22:59.441469: [NET] Routine: receive incoming v6 - started
2022-11-05 15:22:59.949393: [NET] Network change detected with satisfied route and interface order [en0, utun3, pdp_ip0]
2022-11-05 15:22:59.950074: [NET] DNS64: mapped xxx.xxx.xxx.xxx to itself.
2022-11-05 15:22:59.950390: [NET] peer(fTiT…qSc) - UAPI: Updating endpoint
2022-11-05 15:22:59.950768: [NET] Routine: receive incoming v4 - stopped
2022-11-05 15:22:59.950954: [NET] Routine: receive incoming v6 - stopped
2022-11-05 15:22:59.951485: [NET] UDP bind has been updated
2022-11-05 15:22:59.951505: [NET] Routine: receive incoming v4 - started
2022-11-05 15:22:59.951581: [NET] Routine: receive incoming v6 - started
2022-11-05 15:22:59.969322: [NET] peer(fTiT…qSc) - Sending handshake initiation
2022-11-05 15:23:00.063463: [NET] peer(fTiT…qSc) - Received handshake response
2022-11-05 15:23:15.226385: [NET] peer(fTiT…qSc) - Retrying handshake because we stopped hearing back after 15 seconds
2022-11-05 15:23:15.226767: [NET] peer(fTiT…qSc) - Sending handshake initiation
2022-11-05 15:23:19.863684: [NET] Stopping tunnel
2022-11-05 15:23:19.864322: [NET] Device closing
2022-11-05 15:23:19.864617: [NET] Routine: TUN reader - stopped
2022-11-05 15:23:19.864730: [NET] Routine: event worker - stopped
2022-11-05 15:23:19.864842: [NET] Routine: receive incoming v4 - stopped
2022-11-05 15:23:19.864939: [NET] Routine: receive incoming v6 - stopped
2022-11-05 15:23:19.865193: [NET] peer(fTiT…qSc) - Stopping
2022-11-05 15:23:19.865364: [NET] peer(fTiT…qSc) - Routine: sequential sender - stopped
2022-11-05 15:23:19.865368: [NET] peer(fTiT…qSc) - Routine: sequential receiver - stopped
2022-11-05 15:23:19.865511: [NET] Device closed
2022-11-05 15:23:19.865507: [NET] Routine: decryption worker 2 - stopped
2022-11-05 15:23:19.865557: [NET] Routine: handshake worker 2 - stopped
2022-11-05 15:23:19.865603: [NET] Routine: decryption worker 1 - stopped
2022-11-05 15:23:19.865622: [NET] Routine: handshake worker 4 - stopped
2022-11-05 15:23:19.865627: [NET] Routine: decryption worker 5 - stopped
2022-11-05 15:23:19.865678: [NET] Routine: handshake worker 3 - stopped
2022-11-05 15:23:19.865686: [NET] Routine: decryption worker 3 - stopped
2022-11-05 15:23:19.865748: [NET] Routine: handshake worker 5 - stopped
2022-11-05 15:23:19.865807: [NET] Routine: handshake worker 1 - stopped
2022-11-05 15:23:19.865803: [NET] Routine: decryption worker 4 - stopped
2022-11-05 15:23:19.865814: [NET] Routine: decryption worker 6 - stopped
2022-11-05 15:23:19.865826: [NET] Routine: handshake worker 6 - stopped
2022-11-05 15:23:19.866057: [NET] Routine: encryption worker 5 - stopped
2022-11-05 15:23:19.866072: [NET] Routine: encryption worker 4 - stopped
2022-11-05 15:23:19.866079: [NET] Routine: encryption worker 2 - stopped
2022-11-05 15:23:19.866107: [NET] Routine: encryption worker 3 - stopped
2022-11-05 15:23:19.866135: [NET] Routine: encryption worker 6 - stopped
2022-11-05 15:23:19.866141: [NET] Routine: encryption worker 1 - stopped