I have a Trek Allant 7.4, I ride it on the paved trails. I've had it for about 3 years. It's in good shape. Suddenly within the last 3 months I've broken 4 spokes on my back wheel.  The back wheel is fine.  I've had the bike shop check it over and over again.  The other spokes are fine.  I'm just riding when I hear a metallic pop, and the spoke is gone.
Any idea why?
I've actually lost weight recently, so I'm not riding at my heaviest weight.  If it was weight related I would have broken spokes over the past few years.
Can you put more stress on a spoke if you're riding slightly underinflated tires?  I've ridden 3x this weekend and I didn't check my tire pressure this morning.  Worst case scenario they're running at 60-70 instead of the suggested 80-100...
any ideas would be great.        
        
        edronline
        2019-08-25 13:15:53
        
              
          
            Rim or disc brakes? Disc brakes put stress on the spokes since the braking force is transmitted through them to the rim.          
          
          
            jonawebb          
          2019-08-25 15:09:04
        
              
          
            Disc.
I read that if you break one spoke it can put stress on the other spokes and weaken them causing this to happen.  Suggested getting a new wheel or rebuilding it.  Mine are not super expensive so I guess I'm going the new wheel route.           
          
          
            edronline          
          2019-08-25 16:27:10
        
              
          
            Tire pressure has nothing to do with it.  If anything the softer tires should transmit less force to the wheel and spokes.  As for riding with broken spokes, you'd need a bunch of broken spokes to create a domino effect - I'm pretty sure the wheel would be wildly out of true before you got to that point.  I'd have a bike shop re-lace the wheel with quality, heavy-duty spokes.  It sounds like the existing ones are cheap and, like so many other metal objects subjected to stress, have fatigued.              
          
          
            jmccrea          
          2019-08-25 20:34:16
        
              
          
            This is helpful. Thanks          
          
          
            edronline          
          2019-08-25 21:41:06