Lemme check them out. Cheap case? Ermm i rather spend a bit and get a good case bro.

Hmm...what's your budget?

Lowbudget = Kupica, TPU cases and basically these can get below RM 100. How about Rock and Nilkin?

If you have better budget, try get Case Mate, Otterbox as they give better protection.
Not yet out le...I am also waiting but....OB slow to release.

So far experience twice random restart. 
Suddenly heard startup music.  The phone was not in use during that time