Exclamation x8 continous reboot. please help

hello my x8 Is acting strangely
it continuously reboots if I insert sim card or If I have active data connection. it boots to lockscreen and suddenly it reboots after receiving network connection
but it works perfectly if I connect my x8 to charger. while charging eveverything's perfect.. and in airplane mode everything's working.
I flashed stock rom. and all kernels but still same problem in all roms, kernels..
please help
PRESSTHANKS IF I HAVE HELPED U