headsets

Sometimes my headsets wouldn't turn on( happened 3 times in this year. 1st year after the warranity expired), but if I let them 1 day, they would turn back on( maybe when the battery went to 0). Yesterday I used them. 1 hour later they wouldn't work. Tried to charge them, nothing happened. Today...

I recently bought the HyperX Cloud 2 headset, and noticed that you cant distinguish left sounds from right sounds. I tried the headsets in a laptop and in my smartphone , and they sounded fine. Any ideas why this happens?