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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
The classic cause #3 — invisible to remote tests, found in one visit.
Read case →Cause #6 in the wild, documented and resolved.
Read case →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.
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.
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.
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.
Full guide →Same-day on-site across Sydney, 24/7, in English or Chinese. Most replies within minutes.
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