Several people are beginning to report that their S8 or S8+ is overheating while charging. This is of concern after the Note 7 Debacle of last year. Overheating was not the only cause of Note 7 devices bursting into flames. It turns out part of the problem is that the devices were too thin and did not allow for the battery to expand when it did overheat.
The S8 was specifically designed to be a bit thicker to allow for the expanding of the battery. One user noted that his S8+ reached a temperate of 104.5 degrees while charging. Another user chimed in that this may be due to the fact that Samsung is still using QC2.0 for their adaptive fast charging which isn't as efficient and does cause phones to overheat while charging. Hopefully with the added thickness and space for battery expansion in the S8 and S8+ we won't have to worry about any problems.
via AndroidCentral
). I could see that certain cases might interfere with the heat dissipation as intended. You put on a jacket to keep warm so a jacket (case) on a phone could very well do the same.