Every other server is fine? like IRC? Have a look at this, I seriously think your problems are elsewhere.
This just today:
[08:11] * +SR|zeugnimod (zeugnimod@.dip.t-dialin.net) Quit (Ping timeout)
[09:06] * +SR|zeugnimod (zeugnimod@.dip.t-dialin.net) Quit (Ping timeout)
[11:34] * +SR|zeugnimod (zeugnimod@.dip.t-dialin.net) Quit (Ping timeout)
[11:49] * +SR|zeugnimod (zeugnimod@.dip.t-dialin.net) Quit (Ping timeout)
[12:39] * +SR|zeugnimod (zeugnimod@.dip.t-dialin.net) Quit (Ping timeout)
[14:38] * +SR|zeugnimod (zeugnimod@.dip.t-dialin.net) Quit (Ping timeout)
IRC is also probably the last thing to drop the connection if there are issues. PING PONG event is only every 6mins and 40secs.