hmm Iv never had this issue, :c
I had a new 2ds back when they first came out with them and never had a problem. then I traded it in for the sea green which was used, and Iv had it for a year or two with no problems. If you cant find anything online, it might just be a specific quirk to yours? or maybe something you downloaded has had a bad affect? im not sure but talking to Nintendo might be your best option, also if it does still have any sort of warranty on it, maybe see if you can get it replaced?