Hi,
Most probably the ground (the soil) in your place is not stable (or, is "working" = Has slow "drifts", or, in other words: constantly having tiny movements). If that the case it's a major problem and it will never dissapear..... It starts with noises than it follows with cracks..... It's frustrating cause you'll keep on investing and the cracks will keep on comming..... I have a similar problem in my house. If you have a house or a roof made of wood, the noises can be a result of temperature changes (the stucture expands and contrats).
No, the washing machine + the dryer shouldn't damage the beams while spinning (the applied: stresses / vibrations / moments are relatively low).
Best regards,