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Three pieces, each verified on Android across WiFi/cellular switches: - A sweep-aware backoff wrapper: the first retry after a disconnect that follows a recent network-change mark comes after 200ms instead of the randomized [0..1.6s] interval. Any other failure keeps the unchanged spread, so the clients of a restarted server still scatter their reconnects. - The retry sleep wakes on OS network availability transitions (nbgrpc.Retry): a disconnect that precedes the offline flag by a few milliseconds no longer sleeps blindly through the recovery - the loop parks on the netstate gate and resumes the moment the network returns. - The connection state is re-checked after WaitForStateChange: a dial settling in Ready proceeds immediately instead of burning another backoff round on an already-usable channel. Measured after a network switch: management and signal recover in 270-470ms deterministically, down from a 312-1593ms lottery.