sendmail needs frequent restart, STARTTLS error

[will123195]

every once in a while i will notice that the internet delivery queue will start to build up, and i fix it by restarting sendmail:

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/etc/init.d/sendmail restart

also, the maillog had completely filled my /var partition with this:

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Apr 28 16:04:00 host sendmail[818]: STARTTLS: read error=generic SSL error (0)
Apr 28 16:04:00 host sendmail[19426]: STARTTLS: read error=generic SSL error (0)
Apr 28 16:04:00 host sendmail[25080]: STARTTLS: read error=generic SSL error (0)
Apr 28 16:04:00 host sendmail[818]: STARTTLS: read error=generic SSL error (0)
Apr 28 16:04:00 host sendmail[19426]: STARTTLS: read error=generic SSL error (0)
Apr 28 16:04:00 host sendmail[25080]: STARTTLS: read error=generic SSL error (0)

any ideas of what's going on and how to fix this? thanks!