My computer is old, built by me many years ago, it runs WinXP SP3, Intel Core2 6600 @ 2.40GHz, 4gigs ram (OS reports 2.75, blame the old OS).
I read through the debug log but didn't see anything that stood out, but there's tons of crap there. Here's an excerpt from right before my OP, which was right around when my node went down:
2015-03-11 13:30:13 receive version message: /bitcoinseeder:0.01/: version 60000, blocks=230000, us=66.215.192.104:8333, peer=694
2015-03-11 13:30:27 receive version message: /Snoopy:0.1/: version 60001, blocks=0, us=66.215.192.104:8333, peer=695
2015-03-11 13:31:13 receive version message: /Satoshi:0.8.6/: version 70001, blocks=347166, us=66.215.192.104:8333, peer=696
2015-03-11 13:31:15 receive version message: /getaddr.bitnodes.io:0.1/: version 70001, blocks=290000, us=66.215.192.104:8333, peer=697
2015-03-11 13:32:04 receive version message: /Satoshi:0.8.6/: version 70001, blocks=347166, us=66.215.192.104:8333, peer=698
2015-03-11 13:32:55 receive version message: /Satoshi:0.8.6/: version 70001, blocks=347166, us=66.215.192.104:8333, peer=699
2015-03-11 13:33:45 receive version message: /Satoshi:0.8.6/: version 70001, blocks=347166, us=66.215.192.104:8333, peer=700
2015-03-11 13:35:28 receive version message: /Snoopy:0.1/: version 60001, blocks=0, us=66.215.192.104:8333, peer=701
2015-03-11 13:35:45 UpdateTip: new best=00000000000000001229a57e7adf34b96a2ff2e82ef1bb7b70c0dd4bcaa183d2 height=347166 log2_work=82.407841 tx=62068354 date=2015-03-11 12:54:31 progress=0.999948 cache=11205
2015-03-11 13:35:46 UpdateTip: new best=00000000000000000b4119e5823073867332a80339ccd8cd8912570ffd452b45 height=347167 log2_work=82.407886 tx=62069647 date=2015-03-11 13:14:41 progress=0.999973 cache=12439
2015-03-11 13:35:47 UpdateTip: new best=0000000000000000168a0036db4add0f2c3a7bf95ea9596a8e89ce73d6768b7d height=347168 log2_work=82.407932 tx=62070649 date=2015-03-11 13:30:06 progress=0.999993 cache=13354
2015-03-11 13:36:49 receive version message: /getaddr.bitnodes.io:0.1/: version 70002, blocks=347167, us=66.215.192.104:8333, peer=702
2015-03-11 13:37:15 ERROR: AcceptToMemoryPool : inputs already spent
2015-03-11 13:39:11 receive version message: /getaddr.bitnodes.io:0.1/: version 70002, blocks=347167, us=66.215.192.104:8333, peer=703
2015-03-11 13:39:15 ERROR: AcceptToMemoryPool : inputs already spent
2015-03-11 13:39:41 receive version message: /BTCXchange.ro Mapper:0.01/: version 60000, blocks=230000, us=66.215.192.104:8333, peer=704
2015-03-11 13:39:55 ResendWalletTransactions()
2015-03-11 13:40:28 receive version message: /Snoopy:0.1/: version 60001, blocks=0, us=66.215.192.104:8333, peer=705
2015-03-11 13:40:32 receive version message: /bitcoinj:0.12.2/Bitcoin Wallet:4.21/: version 70001, blocks=347003, us=127.0.0.1:8333, peer=706
2015-03-11 13:40:32 Added time data, samples 122, offset -283 (-4 minutes)
2015-03-11 13:41:07 receive version message: /Satoshi:0.9.2.1/: version 70002, blocks=343608, us=66.215.192.104:8333, peer=707
2015-03-11 13:41:07 Added time data, samples 123, offset -285 (-4 minutes)
2015-03-11 13:41:07 nTimeOffset = -285 (-4 minutes)
2015-03-11 13:42:57 receive version message: /getaddr.bitnodes.io:0.1/: version 70001, blocks=290000, us=66.215.192.104:8333, peer=708
2015-03-11 13:43:49 receive version message: /Satoshi:0.8.6/: version 70001, blocks=347167, us=66.215.192.104:8333, peer=709
2015-03-11 13:44:00 receive version message: /getaddr.bitnodes.io:0.1/: version 70002, blocks=347168, us=66.215.192.104:8333, peer=710
2015-03-11 13:44:21 receive version message: /Satoshi:0.8.6/: version 70001, blocks=347167, us=66.215.192.104:8333, peer=711
2015-03-11 13:44:37 receive version message: /BitCoinJ:0.11.2/MultiBit:0.5.18/: version 70001, blocks=347168, us=127.0.0.1:8333, peer=712
2015-03-11 13:44:37 Added time data, samples 124, offset -289 (-4 minutes)
2015-03-11 13:45:31 receive version message: /Snoopy:0.1/: version 60001, blocks=0, us=66.215.192.104:8333, peer=713
2015-03-11 13:45:36 receive version message: /bitcoinj:0.12.2/Bitcoin Wallet:4.21/: version 70001, blocks=335811, us=127.0.0.1:8333, peer=714
2015-03-11 13:45:36 Added time data, samples 125, offset -287 (-4 minutes)
2015-03-11 13:45:36 nTimeOffset = -285 (-4 minutes)
2015-03-11 13:45:42 receive version message: /bitcoinseeder:0.01/: version 60000, blocks=230000, us=66.215.192.104:8333, peer=715
2015-03-11 13:45:50 socket recv error An existing connection was forcibly closed by the remote host. (10054)
2015-03-11 13:46:51 Pre-allocating up to position 0xd00000 in rev00241.dat
2015-03-11 13:46:51 UpdateTip: new best=000000000000000005fe1b18faa2e76c08f420d1a3e4fe280c01a26bbbb074d8 height=347169 log2_work=82.407978 tx=62071632 date=2015-03-11 13:41:28 progress=0.999993 cache=15378
2015-03-11 13:46:54 ERROR: AcceptToMemoryPool : inputs already spent
2015-03-11 13:47:03 socket recv error An existing connection was forcibly closed by the remote host. (10054)
2015-03-11 13:47:19 ERROR: AcceptToMemoryPool : inputs already spent
2015-03-11 13:47:36 ERROR: AcceptToMemoryPool : inputs already spent
2015-03-11 13:47:42 receive version message: /bitcoinseeder:0.01/: version 60000, blocks=230000, us=66.215.192.104:8333, peer=717
2015-03-11 13:47:43 ERROR: AcceptToMemoryPool : inputs already spent
I did a search for "ReadBlockFromDisk" and it turned up 0 results.
A little more detail exactly how I notice the crash. I get an email from Bitnodes that my node is down. I look at my computer screen, bitcoin core is minimized to my task bar; it appears to be running. When I mouse over the icon, the icon disappears - because the program stopped running a while ago when I got the email. Wonder if it has to do with minimize to task bar? I'll turn that off and see.
Thanks.