The phone pack amazing specks. however the total sync between the various included hardware and OS is offset. the phone is prone to frequent crashing and has hanging/screen freezing issue. the battery is of very very poor quality. a fully charged phone can retain charge for 12 hrs(max) on stdby if you play games continuously it discharges in 2-3 hrs. the calling and receiving quality of the phone is worst than even the basic phones. in call shutdown/ automatic call disconnect during call(i have kept good signal strength and all phone features in mind).
The cyanogen is pretty unstable os. it is prone to frequent crashes while opening many apps from google play. its lollipop version is still incompatible with latest google play and other google services update like android web view. over all it is a disappointment of a phone from which a great deal was expected. packing all the hardware is of no use if you can’t use them properly and without getting frustrated.
Then there is a reason of overheating of phone while charging. your phone will get heated up if you open any game and keep the phone idle.