No. of Recommendations: 3
Most likely either the dryer is defective (pulling more current than it used to because some fault has developed) or the breaker has become defective and trips at a lower current than it used to. there something new on that same circuit pulling power? If so then when the dryer comes on it exceeds the circuit's capacity and pops the breaker.

Is it a 110V dryer? If so you might be able to run a heavy duty extension cord (the kind for power tools, not the wimpy ones for lamps) to a different circuit to see if it pops that breaker (make sure the breaker rating is the same and there's not already a load on that circuit). Easier than changing a breaker or diagnosing a dryer, IMO. If that breaker doesn't pop then it's probably the suspect breaker on the original circuit. If it does pop, it is probably the dryer.

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