Z1 wont charge when device power on

hi my Z1 (6902) doesn't seem to charge properly when my phone is on .. i usually get message that battery is draining quickly then charging... i replaced my battery recently everything was working fine and again same problem started, also note if i power off my Z1 its charge at normal speed ...

i have every factory rest and change the rom to MX ROM (Previously i was on stock) and also unlocked bootlocker..

i have tried different power source and adapter but face same issue.. please help

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