I have an ibanez s470dx and the bridge humbucker has lost power, as it even when I have a distortion with lots of gain it still sounds really weak. This has started happening over the last couple of days and I have no idea how to sort it out

Any advice would be appreciated
Check that the pickup is soldered correctly?
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Have you confirmed that this occurs ONLY on the bridge pickup and not the other pickup(s)?
Guitars: Custom Lado Earth 2000-3, Custom ESP Explorer, BC Rich KKV, Gibson LP Studio, Greco SG, El Degas Stratocaster, Agile AL-3000, LTD EX-351

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Yeah, I have. You can hear a clear difference between having the swith at the bridge/middle to having it just at the bridge.