Why is my phone sticking and not working?

[AC Question]

why my phone is stucking and not working?

i have a intex aqua i5 and its running on a custom rom. when i turn on my phone it runs for few min and stucks and reboots angain and angain .... i have tried factory data reset, clear cash, clear dalvic cash but no use i have also installed offecial rom but its not working if any one knows the solution plz help me