I've noticed a problem that has occurred twice over the past week or so. I run two GPU miners (with GUIMiner) at approximately 160Mh/s each. Now GUIMiner reports accepted shares, accepted shares for the last hour and network connection problems in its log. These are the only indicators of miner health directly available to me and are not evidence of anything.
What I have seen is that my miners report normal activity with no connection problems and yet one of the miners has no accepted shares reported on my account log on Slush's pool. The first occasion showed over six hours since the last share had been accepted; the second occasion showed over nine minutes without a share accepted. On both occasions, the time since the last share accepted matched the time since a block was found on Slush's pool but not necessarily the last block. It appears as if one of my miner's shares were no longer be credited after the pool's 'block found' event processing.
On both occasions, I stopped and restarted GUIMiner for the affected miner and share accepted activity on my pool account log resumed normally. The shares lost were not recovered.
Same here the previous night - my fastest miner was not counted though it seemed to be working correctly (/shrug cannot tell for sure I was sleeping but again if my miner stops it doesn't recover on its own and in the morning it looked fine)
18034 2013-05-14 19:27:14 3:35:30 30026262 2702 0.00259934 236202 25.10024000 confirmed <-- Normal, usual fluctuations
18033 2013-05-14 15:51:44 3:34:13 29829536 2654 0.00208799 236182 25.43437400 confirmed <-- Normal, usual fluctuations
18032 2013-05-14 12:17:31 1:26:37 12093844 387 0.00162982 236165 25.15775000 confirmed <-- Recovering ??
...
All those below are missing shares from a faster miner
18031 2013-05-14 10:50:54 0:01:10 157750 3 0.00041860 236154 25.06650000 confirmed
18030 2013-05-14 10:49:44 0:27:05 3751992 110 0.00081932 236153 25.18090000 confirmed
18029 2013-05-14 10:22:39 1:18:11 10929435 317 0.00102232 236148 25.61227001 confirmed
18028 2013-05-14 09:04:28 1:04:00 8890231 227 0.00062620 236145 25.34600000 confirmed
18027 2013-05-14 08:00:28 0:33:49 4716423 114 0.00064109 236136 25.16020001 confirmed
Just posting since somebody else noted the same. Also I definitely see shares missing from one of the miners on the round but normally just on 1 block not the series of blocks in the row.
18026 2013-05-14 07:26:39 0:18:31 2610383 60 0.00060960