Breaking spokes very often at J bend I have a urban commuter bike. Since last couple of months, the spokes at the rear wheel keep breaking after each ride. I changed the broken spokes couple of times. Also I replaced all the spokes. Same thing keeps happening. I weigh around 90 Kg. I have had the bike for 2 years and covered only 6000 Km. I check the spokes before going for a ride. Almost never have I found a loose spoke and yet after the ride I find one broken. Should I replace the whole wheel or just the rim/hub? Is my weight the problem here?

Edit- 1) Being a complete amateur in the field, I didn't know what details mattered. The wheel is Double walled 36H with double cross lacing (Both sided).(This is an assumption. I am attaching photographs to make things clear.)
2) I didn't change the spokes myself. I had it done from a shop.
3) I go over the curb or rather potholes  (We have a lot of those here in India) moderately hard.
This is not normal. A properly built wheel with quality spokes will not break spokes like this. The likely culprits are build quality (spokes over-stressed?) of spokes quality. Take your wheel to a bike mechanic and ask if the spokes tension looks right and if the cross-pattern is OK. If it does, then you are left with poor quality spokes; change them.