I recently bought a pair of these thanks to recommendations here. While the sound is really good I noticed that the sound will distort at times at around 75% volume when my old pair didnt. The thing is it doesnt always happen. Is it a defect or do I just need time to burn them in? Thank you.

Hello guys, first post here so bear with me.   I'm in the market for a new pair of IEMs and having bought several...every time i get dissapointed. First of all, i'm upgrading from a pair of Sony  MDR - EX 10 which i bought for 20 dollars i think a while back. Since then i bought a...