Do you mean business as in earning money, or just going about your daily business?
If you depend on the internet for supporting a business you should probably be on a business package - as the residential one has no SLA for fix times, etc. Also it would be wise to have a fall back connection option - have you got one in place?
That said.... you will get the most up-to-date info about any known problems that are affecting you by calling 0800 561 0061 and see what it reports.
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.