Notification - Party Leader Quit

Product: Apex Legends
Platform:PC
Please specify your platform model. PC
AMD or Nvidia Model Number ASUS GEFORCE GTX 960 4GB
Enter RAM memory size in GB 8GB DDR3
What is your gamertag/PSN ID/EA Account name? ketopekan
Please provide your squad mates' gamertag/PSN ID/EA Account name if possible. misterjoji and one random guy
Which Legend were you playing (if applicable)? Bloodhound
Which Legends were your squad mates using (if applicable)? Bangalore and Pathfinder
Where did the issue occur? In a match
Which part of the map or menu were you in? If you don't remember the exact name, please describe the area or what you were trying to do in the menu. North of Artillery
What were you doing when the issue occurred? E.g. respawning a squad mate at a beacon, using an ability, a squad mate left the game. Was running and climbing hill near the cliff facing the sea where care package was dropped.
Did your squad mates also experience the issue? No
How many matches had you played in a row before the issue occurred? Less than 10
When did this happen? (dd.mm.yy hh:mm) 21.02.2019 07:45 GMT+8
How often does the bug occur? Occasionally (10% - 49%)
How severe is your issue? Major impacts to gameplay
What happens when the bug occurs? Notification "Party Leader Quit appear in the bottom", few seconds afterwards I was kicked out of the game. In the lobby can still see my friend was still "In a Match" status, and he was the party leader. The notification stayed at the bottom of the screen.
What should be happening instead? I'm still in the game.
Steps: How can we find the bug ourselves? Sorry. Not sure what the pattern was to reproduce this error.

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Never had this issue before today, but now in less than five hours, this has happened four times. The first time it happened I was playing using "Lifeline" and was in the middle of gunfight while sniping using "Triple Take" gun. (Attached screenshot for the error message).