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Timing the watchdog off receive progress gave away its upper bound. A fragment bumps the counter as it arrives, ahead of the framing checks that would reject it, so a peer sending one `FRAG_MORE` every twenty seconds and never a `FRAG_END` refreshed the deadline forever while the reassembly buffer grew toward `MAX_FRAME_LENGTH`, a gigabyte away. What it bought - a clipboard image that takes longer than thirty seconds to arrive is not a dead peer - is a pre-existing problem that predates this branch and can be fixed on its own. Receive progress goes back to the one job it was added for, which needs no deadline of its own: telling a transport that has gone quiet from one that is still delivering, so ICE's disconnected hint is not acted on mid-transfer. The Android document picker suppresses a `Connection Error` while it is open and remembers to reconnect once it closes. The peer-gone break reconnects under `restarting-show` with a `Connecting...` title, which matched neither half of that test, so an eight-second stall behind an open picker - Doze and background throttling produce them - threw a dialog up behind the picker and lost the deferred reconnect. It is now named there by its own title rather than by its type: an explicitly restarted remote device sends the same type from a path this leaves alone, on every transport, and deferring that one too would be a change to sessions this has no business touching. The two limits are still not hard upper bounds, and the comment saying so was wrong about why. A send is awaited inline in this loop, so one in progress delays the tick that checks them - bounded on WebRTC by the timeout the stream was built with, not bounded at all on KCP, whose framed stream is constructed with none. The 30s watchdog beside it shares the loop and the same delay. Left alone deliberately. `restarting-show` reconnects without the backoff its `restarting` sibling uses, which can loop while each round gets far enough to establish a session and then loses the transport within eight seconds; a cooldown there would also delay the recovery this exists for when a peer really does come back, and the loading it shows can be cancelled. And the KCP limit reads an accumulated silence rather than a transient hint, so unlike the WebRTC grace it needs no second sample to confirm - one would only move eight seconds to nine. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019aokqJuhjvB3kijXtAg5Ns