NO. The servers are idling miners today. THAT is why. The drop is TOO severe.
That usually means connection problem (big latency).
Looking to your signature (2 workers = 600+Mhs) make me think you have 2 powerful miners ... so you need o good network latency or configure better your miners (try to get more work doing more getwork requests and buffer them).
Ciao
so what would you suggest, other than the following (I am using Phoenix 1.50):
${HOMEDIR}/phoenix-1.50/phoenix.py -u http://${MINERUSER}:${MINERPASS}@${$MINERSERV} -q 3 -k phatk VECTORS BFI_INT AGGRESSION=12 WORKSIZE=128 DEVICE=${1}
where $MINERSERV is either uswest or uscentral.
Both miners on Xubuntu boxen, one is catalyst 11.5, the other is 11.6; both use APP SDK 2.4. (that shouldn't affect the behavior that is occurring today with BTCGuild)