ADX data receiving stop after sometime

I have very strange problem. I have IOT application where device send data to IOT hub, then it routed to event hub. There is function with trigger as azure function ,this function insert data in to ADX .

I trace the event from device to event hub. I can see all data  I can also see function get trigger ,no error.But in ADX empty record, no data from event. Just date field which add explicitly. 

Note- Again after some time I can see data in ADX (no change in ADX not even restart any service).

Can any body have clue what exactly could be issue?