A connection that drops for thirty seconds and comes back is more maddening than one that's fully dead — and harder to get your ISP to take seriously. After hundreds of dropout jobs across Sydney, the causes below cover almost every case we see, ranked roughly by how often we find them. Work through the self-checks before paying anyone, including us.
断三十秒又自己恢复的网络，比彻底断掉的更让人抓狂 — 也更难让运营商当回事。在悉尼修过几百单掉线之后，下面这些原因几乎覆盖了我们见过的所有情况，按出现频率大致排序。找任何人（包括我们）之前，先照着自查一遍。
An overheating or ageing modem/router. Hardware jammed in a sealed weak-current box cooks itself in summer, then reboots or drops sync. Self-check: touch it — if it's too hot to hold comfortably, ventilate it and watch for a week.
光猫/路由器过热或老化。塞在密闭弱电箱里的设备夏天把自己烤到重启或失步。自查：摸一下 — 烫得拿不住就先通风，观察一周。
WiFi interference masquerading as an NBN dropout. Your internet is fine — your WiFi is dropping. Self-check: when it happens, check whether a cabled device also loses internet. If cable survives, it's a WiFi problem, not NBN.
WiFi 干扰伪装成 NBN 掉线。网本身没断 — 是 WiFi 在掉。自查：掉线时看有线设备是否也断。有线没断，就是 WiFi 问题，不是 NBN。
A failing wall socket or in-wall cable run. Corroded joints and tired copper drop sync intermittently, especially in older Eastern Suburbs buildings. The ISP's remote tests almost never see this. Fixing it legally requires an ACMA-registered cabler — ours are partners we bring in.
墙口或墙内线路老化。氧化的接头和疲劳的铜线会间歇性失步，东区老楼尤其常见。ISP 远程测试几乎看不到这种问题。依法必须由 ACMA 注册布线技师修 — 我们有合作的持证技师。
Power problems feeding the equipment. Cheap multi-way power boards and failing plug packs cause micro-outages that look like line faults. Self-check: plug the modem directly into a wall outlet with its original adapter.
设备供电问题。廉价排插和老化电源会造成看起来像线路故障的微断电。自查：用原装电源把光猫直接插墙面插座。
Provisioning or profile errors at the ISP. Wrong speed profile, a stuck session, an unstable line profile on FTTN — invisible from your side, fixable only by the ISP. This is where an independent test report forces action.
运营商配置或线路参数错误。错误的速率配置、卡住的会话、FTTN 上不稳定的线路参数 — 你这边看不见，只有 ISP 能改。这正是独立实测报告发挥作用的地方。
Congestion or a degraded line in the street. Evening-only slowdowns and drops, or dropouts every time it rains, point outside your walls. Rain-triggered faults are classic corroded-pit symptoms — document the pattern with timestamps.
街道侧拥塞或线路劣化。只在晚上变慢变断、或一下雨就掉线，问题多半在墙外。下雨就断是接线井氧化的经典症状 — 记下每次发生的时间作为证据。
A genuine NBN network fault. Least common, but real: failed street equipment, damaged lead-ins, area outages. Check your provider's outage page first; if it persists, this needs escalation with evidence, not more reboots.
真正的 NBN 网络故障。最少见但真实存在：街道设备故障、入户线损坏、区域断网。先查运营商的 outage 页面；持续发生就需要带证据上报，而不是继续重启。
First, separate WiFi from line: during a dropout, check a cabled device or watch the modem's sync light. If the sync light stays solid while WiFi dies, your fix is on the WiFi side. Second, power-cycle once — properly: modem off 30 seconds, then on, then the router. Third, check your provider's outage page and app. Fourth, note the pattern: time of day, weather, what was running. That pattern is the single most useful thing you can tell any technician.
第一步，把 WiFi 和线路分开：掉线时看有线设备、或盯着光猫的同步灯。同步灯常亮而 WiFi 断了，问题就在 WiFi 侧。第二步，正确地断电重启一次：光猫断电 30 秒再开，然后开路由器。第三步，查运营商的 outage 页面和 App。第四步，记录规律：几点、什么天气、当时在跑什么。这个规律是你能告诉任何技师的最有用信息。
If the dropouts survive all four checks, you're past the reboot-it stage. The next step is measurement: line stats from the modem, sync history, and testing at the NBN connection point directly — which is where we come in, same-day across Sydney.
四步都过了还在掉，说明已经过了「重启试试」的阶段。接下来需要测量：读光猫线路参数、同步历史、直接在 NBN 接入点测试 — 这就是我们的活了，全悉尼尽量当天上门。
ISPs triage by evidence. "It drops sometimes" earns you a scripted reboot. "Sync lost 14 times in 48 hours, timestamps attached, line attenuation reading X, tested at the NTD with a known-good router" earns escalation to a level-2 team or an NBN Co truck. Our diagnosis visits produce exactly that evidence, and we'll make the call with you or for you — in English.
运营商按证据分级处理。「有时会断」只会换来照本宣科的重启指导。「48 小时失步 14 次、时间戳在此、线路衰减读数 X、已在 NTD 上用确认正常的路由器实测」才能升级到二线团队或约来 NBN Co 的工程车。我们的诊断上门产出的正是这种证据，并且可以陪你打或代你打电话 — 用英文。
The classic cause #3 — invisible to remote tests, found in one visit.
经典的原因三 — 远程测试隐形，一次上门查明。
Read case →查看案例 →Cause #6 in the wild, documented and resolved.
原因六的真实版本，记录并解决。
Read case →查看案例 →Time-locked dropouts point to congestion, a neighbour's device causing interference, or scheduled equipment behaviour — not random hardware failure. Log the exact times for a week; the pattern usually identifies the culprit.
固定时间掉线指向拥塞、邻居设备干扰或某设备的定时行为 — 而不是随机硬件故障。连记一周准确时间，规律通常能锁定元凶。
Water getting into a corroded street pit or damaged lead-in cable — a physical network fault. Document dates and weather, then escalate; this is NBN-side and fixable, but only with persistent evidence.
雨水渗进氧化的接线井或破损的入户线 — 物理层网络故障。记录日期和天气后上报；这在 NBN 侧、可以修，但需要持续的证据。
Only if the router is actually the fault — which is true in a minority of cases. Diagnose first: if the modem loses sync, a new router changes nothing. That's the most common wasted $300 we see.
只有当路由器真是故障源时才有用 — 这只占少数。先诊断：如果是光猫失步，换路由器毫无作用。这是我们见过最常见的白花 $300。
An independent technician. We test both sides of the boundary: faults in your home get fixed on the spot, network-side faults get documented so your ISP can't close the ticket.
独立技师。我们把分界两侧都测：家里的故障当场修，网络侧的故障写成证据，让运营商没法随手关单。
Full guide →完整指南 →Same-day on-site across Sydney, 24/7, in English or Chinese. Most replies within minutes.
全悉尼当天上门、24 小时、中英双语。大多数消息几分钟内回复。
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