Not sure if it's been reported yet. Every time I get to Wave 20, we lose a player. With the experiences I have had, getting a replacement is pretty much impossible, as it takes several waves to register a replacement.
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Hi there, Thanks for reporting. The team is already aware of this issue and is now being investigated.
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My speculation is that people are completing the 20 wave bounty offered weekly by Arcite-99 and then leaving. Unfortunately, nothing can force a player to remain in an activity if they want to leave, and the matchmaking service can take a while before it finds someone to bring in to replace the departed guardian. I recommend you post your experience in the feedback section, as there's not much to suggest in the help section aside from creating your own team.