A.T. Robertson Commentary 1 Corinthians 11:30

"For this cause many among you are weak and sickly, and not a few sleep." — 1 Corinthians 11:30 (ASV)

And not a few sleep (κα κοιμωντα ικανο). Sufficient number (ικανο) are already asleep in death because of their desecration of the Lord's table. Paul evidently had knowledge of specific instances. A few would be too many.