DisconnectByClientTimeout - how to know if I overrun the buffer?

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Moloko
Moloko
I'm getting random disconnects on master when a client joins - DisconnectCause.DisconnectByClientTimeout.
I suspect I'm overrunning the buffer on Photon Cloud because I'm sending big packets on start. However this behaviour is very random and I am simply not sure what is the problem. Is there a way to confim that I am getting a full buffer error?

How could I prevent this?
How much can I actually send before buffer overrun?