JithinJinadevan mine was working flawlessly until 2.5.5 arrived. Then it began to overheat lag and drop frames after 15 minutes of gaming. Story is still the same with 2.6.
But on the other hand COD Mobile is still running flawlessly without any sort of heating on highest settings. I guess it is an optimisation issue with Efootball. Hope team Nothing fixes that. Otherwise there is no issue in my device on performance front.