huh wow. i never tried the drop myself either..
but yes, i told you in channel (irc.anope.org @ #anope) that i have an other idea how this can happen and that exactly the proble mwhich iam facing all the time.
i just dont really restart anope, so it happens once a year or maybe only twice, but i have exactly one channel where i can see that the prob exists.
i have no clue why it happens, i guess its a bug. but i will drop the channel too and i hope it will work for me too (of course this is just a workaround.