Circuit Breakers: Do they degrade over time and start tripping?
Don't assume it is the breaker...

I had a tripping fault that was intermittent, spent a huge amount of time looking for it...

Eventually it became so frequent that I disconnected room by room every single appliance and eventually found the culprit - a washing machine that was failing when under load and hot...

So, it may not be the breaker - it could just be doing its job and keeping you safe from faulty equipment... You need to investigate.