8/28/2018 8:05 PM
Edited Date/Time: 8/28/2018 8:12 PM
The rims are what's causing that, assuming you've torqued the spokes correctly. It'll keep happening too, because the rims are soft as butter due to both cheaper and lighter alloys being used.
The spokes are worth replacing as well though, because one could argue that they don't make enough thread contact within the nipple, which leads to shearing off nipples even if they haven't necessarily been overtightened (they switched to aluminum nipples back in '09 if I remember correctly, which is weaker than steel). Also, the drive side of the rear hub is extremely thin, and they only have a single bearing on that side. The Japanese bikes all come with double bearings on the drive side for strength and durability.
All three things I just listed technically contribute to KTM's weight saving attributes, but they come with downsides that basically domino one component failing into to the next, which you're unfortunately running into.
Hope that all makes sense.