phone hangs, restarts a lot topic

hi

Recently purchased a CM 11 powered Yureka phone in India from Amazon. The phone does well but off late, hangs a lot (atleast 2-3 times a day, especially during gaming), keeps restarting on its own and system UI keeps crashing, the battery never charges to full capacity, the max it reaches is 99%.

Any fix to the problem or should i opt for a return?

[Q] Xperia X2 hangs on windows logo topic

I had this on my shelf for some time.
Yesterday I tried to use it and It seems to have a problem. It will stuck on indows logo. (is it possibe that its windows is gone!)

I tried the sony site and the Xperia X2 is gone.
So is it in any way possible to resort and make this puppy working again.
Please be kind as to provide link or some steps as to how I could go about it. ( I am fairly new to this family of phones. I moostly done bussiness with android phones)
Thanks and hope for the best ;)

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