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base.py's _keep_typing refresh loop calls send_typing every ~2s while the agent is processing. If signal-cli returns NETWORK_FAILURE for the recipient (offline, unroutable, group membership lost), the unmitigated path was a WARNING log every 2 seconds for as long as the agent stayed busy — a user report showed 1048 warnings in 41 minutes for one offline contact, plus the matching volume of pointless RPC traffic to signal-cli. - _rpc() accepts log_failures=False so callers can route repeated expected failures (typing) to DEBUG while keeping send/receive at WARNING. - send_typing() tracks consecutive failures per chat. First failure still logs WARNING so transport issues remain visible; subsequent failures log at DEBUG. After three consecutive failures we skip the RPC during an exponential cooldown (16s, 32s, 60s cap) so we stop hammering signal-cli for a recipient it can't deliver to. A successful sendTyping resets the counters. - _stop_typing_indicator() clears the backoff state so the next agent turn starts fresh. E2E simulation against the reported 41-minute window: RPCs drop from 1230 to 45 (-96%), log lines from 1048 WARNINGs to 1 WARNING + 44 DEBUGs. Credits kshitijk4poor (#12056) for the _rpc log_failures kwarg idea; the broader restructure in that PR (nested per-chat loop inside send_typing) is avoided here in favour of stateful backoff that preserves base.py's existing _keep_typing architecture.