Increase in 'DisconnectByServerTimeout' lately

I've had some players get randomly disconnected from games, calling OnConnectionFail with this disconnect cause. A very small handful aren't able to play for more than five minutes without getting disconnected. There's no other errors in the log, although it does seem to be preceded by the message "Unloading [n] unused Assets to reduce memory usage".

Is there something I should be checking for to see what the root cause is here? Did something change recently on your end that might cause this?

Thanks for any info.