i found this error on 4 shards:

Shard7
...
Wed Apr 27 02:18:32 [conn2351] waiting till out of critical section
Wed Apr 27 02:18:32 [conn1336] waiting till out of critical section
Wed Apr 27 02:18:32 [conn2346] waiting till out of critical section
Wed Apr 27 02:18:32 [conn2721] ERROR: moveChunk commit failed: version is at35|27 instead of 36|1
Wed Apr 27 02:18:32 [conn2721] ERROR: TERMINATING
Wed Apr 27 02:18:32 dbexit:
Wed Apr 27 02:18:32 [conn2721] shutdown: going to close listening sockets...
Wed Apr 27 02:18:32 [conn2721] closing listening socket: 5
Wed Apr 27 02:18:32 [conn2721] closing listening socket: 6
Wed Apr 27 02:18:32 [conn2721] closing listening socket: 7
Wed Apr 27 02:18:32 [conn2721] closing listening socket: 8
Wed Apr 27 02:18:32 [conn2721] removing socket file: /tmp/mongodb-27025.sock
Wed Apr 27 02:18:32 [conn2721] removing socket file: /tmp/mongodb-28025.sock
Wed Apr 27 02:18:32 [conn2721] shutdown: going to flush diaglog...
Wed Apr 27 02:18:32 [conn2721] shutdown: going to close sockets...
Wed Apr 27 02:18:32 [conn2721] shutdown: waiting for fs preallocator...
Wed Apr 27 02:18:32 [conn2721] shutdown: closing all files...
Wed Apr 27 02:18:32 [conn1512] end connection 127.0.0.1:59598
Wed Apr 27 02:18:32 [conn1] end connection 127.0.0.1:41416
Wed Apr 27 02:18:32 [conn2] end connection 127.0.0.1:41423
Wed Apr 27 02:18:32 [conn2324] waiting till out of critical section
Wed Apr 27 02:18:32 [conn2723] end connection 172.18.62.121:37566
Wed Apr 27 02:18:32 [conn15] end connection 172.18.62.121:47347
Wed Apr 27 02:18:32 [conn6] getmore local.oplog.rs cid:4113803593812577328 getMore: { ts:

} exception 11600 interrupted at shutdown bytes:20 nreturned:0 1770ms
Wed Apr 27 02:18:32 [conn2722] end connection 172.18.62.121:44842
Wed Apr 27 02:18:32 [conn6] SocketException in connThread, closing client connection
Wed Apr 27 02:18:32 [initandlisten] now exiting
Wed Apr 27 02:18:32 dbexit: ; exiting immediately
Wed Apr 27 02:18:32 Invalid access at address: 0x30
Wed Apr 27 02:18:32 Got signal: 11 (Segmentation fault).
Wed Apr 27 02:18:32 [conn2041] waiting till out of critical section

Shard3:
...
Wed Apr 27 05:08:56 [conn2027] waiting till out of critical section
Wed Apr 27 05:08:56 [conn2736] ERROR: moveChunk commit failed: version is at58|19 instead of 59|1
Wed Apr 27 05:08:56 [conn2736] ERROR: TERMINATING
Wed Apr 27 05:08:56 dbexit:
Wed Apr 27 05:08:56 [conn2736] shutdown: going to close listening sockets...
Wed Apr 27 05:08:56 [conn2736] closing listening socket: 5

Shard18:
Wed Apr 27 11:07:01 [conn2401] waiting till out of critical section
Wed Apr 27 11:07:01 [conn2439] waiting till out of critical section
Wed Apr 27 11:07:01 [conn2728] ERROR: moveChunk commit failed: version is at52|9 instead of 53|1
Wed Apr 27 11:07:01 [conn2728] ERROR: TERMINATING
Wed Apr 27 11:07:01 dbexit:
Wed Apr 27 11:07:01 [conn2728] shutdown: going to close listening sockets...

Shard19:
...
Wed Apr 27 13:22:00 [conn2312] waiting till out of critical section
Wed Apr 27 13:22:00 [conn2270] waiting till out of critical section
Wed Apr 27 13:22:00 [conn2747] ERROR: moveChunk commit failed: version is at65|15 instead of 66|1
Wed Apr 27 13:22:00 [conn2747] ERROR: TERMINATING
Wed Apr 27 13:22:00 dbexit:
Wed Apr 27 13:22:00 [conn2747] shutdown: going to close listening sockets...