Streaming video is going to tax any computer or phone. I use gsam battery monitor and if I'm "playing hard" with the phone using apps for a long period of time or watching any video mine will regularly go to around 103 F or more. I don't think that is really that hot or unusual. Heck, I live in Phoenix and the outside temp can exceed 110, so if I'm outside a long time I know the phone is going to be over 100. At rest, sitting on my desk inside an air conditioned building, my Turbo will drop to as low as 75.
I see 115 regularly when playing games or HD video on my quad core 5.2 inch G2. Doesn't sound too hot, however, I have a case on mine too, so it might stay warmer and also means I dont feel the heat.
I used to keep mine in an otterbox case but the temps were reaching over
120. So I don't keep it in a case anymore. I even turn the brightness all
the way down. I took a few apps off like my virus scanner, so far nothing
has helped. I think I am just gonna get the Note 5 when it comes out.
Yes Dirk, I think this is just normal for all these devices. I don't think there is anything wrong with yours. I just did a cache clear on mine which took about 20 minutes and when it came back on just sitting on a marble (cool) table it was 104 degrees.
I don't know why it takes that long on the Turbo. When I had Samsung devices it only took maybe a minute. Some are saying on other forums that it also re-formats the partition, which could be why it takes longer. If you notice in the small letters on the bottom left while it is clearing it does say formatting.