Is this a bug or a feature? If it's a bug, would a more verbose log help you to isolate the problem? (cgminer is latest GIT source, BTW).
edit: if a pool is that unreliable, you really have to consider whether it's worth mining there or not.
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[2012-05-04 06:41:01] Accepted f1074f52.368b967a GPU 1 pool 0
[2012-05-04 06:41:03] Accepted 12a02d09.919f7d23 BFL 4 pool 0
[2012-05-04 06:41:03] Accepted 2f0b703d.373c52da BFL 4 pool 0
[2012-05-04 06:41:04] Accepted c8bbcb1b.9f5698c8 BFL 3 pool 0
[2012-05-04 06:41:05] Accepted d1ce7a88.c0efb3e8 BFL 2 pool 0
[2012-05-04 06:41:05] Accepted a3f37c21.19c0f185 BFL 2 pool 0
[2012-05-04 06:41:12] Accepted 06eaeb30.7ef6d0ce GPU 1 pool 0
[2012-05-04 06:41:13] Pool 0 not providing work fast enough
[2012-05-04 06:41:17] Accepted 211ee32c.87354a4b BFL 1 pool 0
[2012-05-04 06:41:23] Accepted 2d7c9db2.6a02fbbe GPU 2 pool 0
[2012-05-04 06:41:23] Accepted e0f755c5.b8a15153 GPU 1 pool 0
[2012-05-04 06:41:34] Accepted 11fd8e56.2c088465 GPU 2 pool 0
[2012-05-04 06:41:35] Pool 0 communication failure, caching submissions
[2012-05-04 06:41:35] longpoll failed for http://pool.bonuspool.co.cc:80/LP, sleeping for 30s
[2012-05-04 06:41:37] Pool 0 not providing work fast enough
[2012-05-04 06:42:08] longpoll failed for http://pool.bonuspool.co.cc:80/LP, sleeping for 30s
[2012-05-04 06:42:14] Pool 0 http://pool.bonuspool.co.cc:80 not responding!
[2012-05-04 06:42:14] Switching to http://pool.ABCPool.co:8332
[2012-05-04 06:42:21] Accepted 4fb4ba89.279b420a BFL 0 pool 1
[2012-05-04 06:42:24] Accepted 6d6d108d.e73b79f4 GPU 1 pool 1
[2012-05-04 06:42:24] Accepted e026ffbd.83b870ee BFL 1 pool 1
sudo modprobe ftdi_sio vendor=0x0403 product=0x6014
ftdi_sio vendor=0x0403 product=0x6014
sudo modprobe ftdi_sio vendor=0x0403 product=0x6014
cgminer version 2.4.0 - Started: [2012-05-03 10:31:14]
--------------------------------------------------------------------------------
(5s):312.0 (avg):302.1 Mh/s | Q:4804 A:2429 R:149 HW:0 E:51% U:4.0/m
TQ: 1 ST: 3 SS: 50 DW: 1276 NB: 77 LW: 5384 GF: 26 RF: 26
Connected to http://pool.ABCPool.co:8332 with LP as user XXXXXX
Block: 000004aaff274ef6bfc969765f953f1a... Started: [20:33:38]
--------------------------------------------------------------------------------
[P]ool management [G]PU management [S]ettings [D]isplay options [Q]uit
GPU 0: 73.0C 2391RPM | 311.8/302.1Mh/s | A:2429 R:149 HW:0 U: 4.00/m I: 6
--------------------------------------------------------------------------------
0: Disabled Alive Priority 0: http://pool.bonuspool.co.cc:80 User:XXXX
1: Enabled Alive Priority 1: http://pool.ABCPool.co:8332 User:XXX
2: Enabled Alive Priority 2: http://pit.deepbit.net:8332 User:XXXX
3: Enabled Alive Priority 3: http://mine2.btcguild.com:8332 User:XXXXX
Current pool management strategy: Failover
[A]dd pool [R]emove pool [D]isable pool [E]nable pool
[C]hange management strategy [S]witch pool [I]nformation
Or press any other key to continue
cgminer version 2.4.0 - Started: [2012-05-03 10:31:14]
--------------------------------------------------------------------------------
(5s):312.0 (avg):302.1 Mh/s | Q:4804 A:2429 R:149 HW:0 E:51% U:4.0/m
TQ: 1 ST: 3 SS: 50 DW: 1276 NB: 77 LW: 5384 GF: 26 RF: 26
Connected to http://pool.ABCPool.co:8332 with LP as user XXXXXX
Block: 000004aaff274ef6bfc969765f953f1a... Started: [20:33:38]
--------------------------------------------------------------------------------
[P]ool management [G]PU management [S]ettings [D]isplay options [Q]uit
GPU 0: 73.0C 2391RPM | 311.8/302.1Mh/s | A:2429 R:149 HW:0 U: 4.00/m I: 6
--------------------------------------------------------------------------------
0: Disabled Alive Priority 0: http://pool.bonuspool.co.cc:80 User:XXXX
1: Enabled Alive Priority 1: http://pool.ABCPool.co:8332 User:XXX
2: Enabled Alive Priority 2: http://pit.deepbit.net:8332 User:XXXX
3: Enabled Alive Priority 3: http://mine2.btcguild.com:8332 User:XXXXX
Current pool management strategy: Failover
[A]dd pool [R]emove pool [D]isable pool [E]nable pool
[C]hange management strategy [S]witch pool [I]nformation
Or press any other key to continue
cgminer version 2.4.0 - Started: [2012-05-03 10:31:14]
--------------------------------------------------------------------------------
(5s):312.0 (avg):302.1 Mh/s | Q:4804 A:2429 R:149 HW:0 E:51% U:4.0/m
TQ: 1 ST: 3 SS: 50 DW: 1276 NB: 77 LW: 5384 GF: 26 RF: 26
Connected to http://pool.ABCPool.co:8332 with LP as user XXXXXX
Block: 000004aaff274ef6bfc969765f953f1a... Started: [20:33:38]
--------------------------------------------------------------------------------
[P]ool management [G]PU management [S]ettings [D]isplay options [Q]uit
GPU 0: 73.0C 2391RPM | 311.8/302.1Mh/s | A:2429 R:149 HW:0 U: 4.00/m I: 6
--------------------------------------------------------------------------------
0: Disabled Alive Priority 0: http://pool.bonuspool.co.cc:80 User:XXXX
1: Enabled Alive Priority 1: http://pool.ABCPool.co:8332 User:XXX
2: Enabled Alive Priority 2: http://pit.deepbit.net:8332 User:XXXX
3: Enabled Alive Priority 3: http://mine2.btcguild.com:8332 User:XXXXX
Current pool management strategy: Failover
[A]dd pool [R]emove pool [D]isable pool [E]nable pool
[C]hange management strategy [S]witch pool [I]nformation
Or press any other key to continue