Lava Mobiles — lava mobile phone z70

Address:	Faridabad, Haryana, +91
Website:	www.lavamobiles.com

SIR,
i had purchased a lava mobile phone z70 and gifted to my dad after 10 days it start creating problems like hang, sysytem URI not responding, aries not responding and many other functions like close app or wait dnt know what what, finger sensor started working very slowly or my dad not uses phone much as no more apps are installed 7.17 gb still available then why this problem is arising after seeing this i had reset my phone after resetting the phone it start working in good condition and then after three to four days, the same problem start again ...and even if we are not using the phone than it also start heating by own .please sir help me out ...thanks .
Regards
SHAAN TANWAR