This was already reported, but its been happening for days now:

 [2013-12-30 17:01:20] Stratum connection to pool 0 interrupted
 [2013-12-30 17:02:06] Stratum connection to pool 0 interrupted
 [2013-12-30 17:03:14] Stratum connection to pool 0 interrupted
 [2013-12-30 17:05:14] Stratum connection to pool 0 interrupted
 [2013-12-30 17:10:55] Stratum connection to pool 0 interrupted
 [2013-12-30 17:11:13] Stratum connection to pool 0 interrupted

It is steadily doing that about 20-30 times an hour, it didn't do that at all before 2 days ago. It can't be good for my share rate, it resumes after about 10 seconds each time it drops. If it was a coin change, that would be a "Network diff set to" message, but there isn't.