Just now some of your servers just crashed, including mine, pecon's and grapple knife's.
I happened to be running a trace:
Entering timeBomb::process(4287)
Entering AutoSaver_Bomb::onTick(4287, 1202693)
Entering AutoSaver_saveBricks(autosave, 1, 1)
Entering getBrickGroupFromObject(4624)
Leaving getBrickGroupFromObject() - return 4611
Entering getBrickGroupFromObject(4625)
Leaving getBrickGroupFromObject() - return 4611
Entering getBrickGroupFromObject(4642)
Leaving getBrickGroupFromObject() - return 4611
Entering getBrickGroupFromObject(4734)
Leaving getBrickGroupFromObject() - return 4611
Entering getBrickGroupFromObject(4735)
Leaving getBrickGroupFromObject() - return 4611
Entering getBrickGroupFromObject(4743)
Leaving getBrickGroupFromObject() - return 4611
Entering getBrickGroupFromObject(4969)
Leaving getBrickGroupFromObject() - return 4611
Entering getBrickGroupFromObject(4970)
Leaving getBrickGroupFromObject() - return 4611
Entering getBrickGroupFromObject(4971)
Leaving getBrickGroupFromObject() - return 4611
Entering getBrickGroupFromObject(4972)
Leaving getBrickGroupFromObject() - return 4611
Entering getBrickGroupFromObject(4973)
(Repeats endlessly)
As you can see, the culprit seems to be the autosaver (or saving in general). This could explain why only some servers go down, and why it happens at regular intervals.
The autosaver used to work fine before, but perhaps this is related to the server being switched?