Card machine problems: declines, crashes and dropped connections
Most card machine problems come down to one of four causes: connectivity, outdated terminal software, a fault with the acquirer rather than the device, or hardware reaching end of life. The fixes below resolve the first three in minutes; the fourth — and a provider that will not support you through any of them — is a reason to switch.
A card machine that fails during service costs real revenue: queues walk, and cash-only sales shrink with every year. Treat repeat failures as a business problem, not an IT annoyance.
Why does my card machine keep declining payments?
A card machine declining every card is almost never about the cards — it is the terminal failing to reach the acquirer, or the acquirer rejecting the merchant connection. A single declined card is the customer’s bank; every card declining is your machine, your connection, or your account.
- Restart the terminal first. A surprising share of decline storms clear on reboot.
- Check connectivity: if the terminal is Wi-Fi-only and the router is struggling at peak, that is the fault. Terminals with 4G/SIM failover keep taking payments when broadband drops.
- Check for a provider outage — acquirers publish status pages, and outages typically hit every terminal on that acquirer at once.
- If declines persist with good connectivity, call the provider: account-level holds (failed direct debit, KYC review) silently stop authorisations.
Why does my card machine freeze or crash mid-transaction?
Freezing during a transaction usually means outdated terminal software or ageing hardware. Terminals receive regular software updates; a machine that has not updated (often because it is switched off overnight during its update window) accumulates bugs until it misbehaves. Leave the terminal on and connected overnight once a week to let updates apply.
If the terminal is several years old and freezes persist after updates, the hardware is the problem. Ask the provider about replacement terms — and if the answer involves a charge for replacing their own failing hardware mid-contract, weigh that against switching provider at renewal.
What should I expect from my provider when things go wrong?
The realistic standard: support that answers quickly (including evenings and weekends if you trade then), next-day replacement of failed hardware, and settlement that is not delayed by the fault. A provider that misses all three repeatedly is costing more than any headline fee saving.
When a fault costs you a busy service, log it: date, duration, what support said. A short log turns "the machine keeps playing up" into evidence — useful for a complaint, for exiting a contract on service grounds, and for choosing the next provider.
When is it time to switch card machine provider?
Switch when failures are recurring rather than one-off, when support cannot resolve them, or when the hardware is end-of-life and the provider wants you to fund its replacement. Check the notice period and any exit fee in your contract first — cancellation terms decide whether switching now or at renewal makes sense. Our cancellation guides cover the mechanics for each major provider.
Frequently asked questions
Why is my card machine declining every card?
When every card declines, the cause is the terminal, its connection, or the merchant account — not the customers. Restart the terminal, check its internet connection, then check the provider’s status page for an outage. If declines continue, call the provider: account-level holds can silently stop all authorisations.
Why does my card machine keep losing connection at busy times?
Busy-period drops usually mean the terminal shares congested Wi-Fi with everything else in the building. Fixes: move the terminal to a dedicated network or band, or use a terminal with built-in 4G/SIM failover so payments continue when broadband struggles.
Can I leave my card machine contract early because of faults?
Depends on the contract. Persistent, documented faults the provider fails to fix can amount to a service failure that supports early exit or a negotiated release — keep a log of every incident and support contact. Otherwise, exit is governed by the notice period and any remaining-term fees. Check the contract before assuming either way.
Do I lose money while my card machine is down?
Usually, yes — most walk-in businesses cannot recover sales lost while unable to take cards. That is why support speed and hardware replacement terms matter as much as transaction rates when comparing providers, and why a terminal with mobile-data backup is worth having where card sales dominate.
Machine letting you down?
Tell us what keeps failing. We will tell you honestly whether it is fixable or worth switching.
CapExpand Ltd (Company No. 14433858) is an authorised Dojo partner, not a card machine manufacturer. We are not currently authorised or regulated by the Financial Conduct Authority. Card machine pricing and availability are subject to change. All information on this page is for general guidance only.