That wheel doesn't sound like it was ever finished trued and tensioned properly. Sounds like to me that it was an 80 percent finished wheel when it came to the bike shop and they just let it go out the door with low tension. Low tension leads to popping spokes on bigger/stronger riders. Once 3 or so spokes pop on a wheel and if it is not fully properly tensioned after repair, the other spokes are probably weakened to the point that they will pop as well.

I would get a new wheel if you can get one under warranty or rebuild the entire wheel with all new spokes and get it properly tensioned.

I had a wheel that popped 4 spokes that had low tension and I rebuilt it completely and haven't had a single problem with it since then.

Its all about proper high tensioned spokes for larger/stronger riders.

Being single speed should mean nothing to the durability of a wheel.