ASA5555的设备自动重启不知道什么原因求大神指导

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机器在昨天晚上自动重启了，不知道什么原因导致,，日志已经查看不到昨天的了。因为业务比较重要，万一在白天工作时候重启了那就麻烦大了，求大神指导，在线等待。
日志最早都是早上九点多的了
2|Aug 19 2015|09:31:42|106006|172.16.77.119|63173|172.16.5.208|8610|Deny inbound UDP from 172.16.77.119/63173 to 172.16.5.208/8610 on interface inside2
4|Aug 19 2015|09:31:42|313005|||||No matching connection for ICMP error message: icmp src inside2:172.16.172.39 dst dmz2:172.16.2.24 (type 3, code 3) on inside2 interface.  Original IP payload: udp src 172.16.2.24/53 dst 172.16.172.39/52211.
2|Aug 19 2015|09:31:42|106001|172.16.168.13|1115|172.16.253.5|9999|Inbound TCP connection denied from 172.16.168.13/1115 to 172.16.253.5/9999 flags SYN  on interface inside2
4|Aug 19 2015|09:31:42|313005|||||No matching connection for ICMP error message: icmp src dmz2:172.16.2.10 dst outside:223.5.5.5 (type 3, code 3) on dmz2 interface.  Original IP payload: udp src 223.5.5.5/53 dst 172.16.2.10/54345.
2|Aug 19 2015|09:31:42|106006|172.16.135.17|59228|172.16.25.254|161|Deny inbound UDP from 172.16.135.17/59228 to 172.16.25.254/161 on interface inside2
4|Aug 19 2015|09:31:41|410001|172.16.157.20|3050|103.28.9.33|53|Dropped UDP DNS request from inside2:172.16.157.20/3050 to outside:103.28.9.33/53; label length 120 bytes exceeds protocol limit of 63 bytes
2|Aug 19 2015|09:31:41|106006|172.16.93.21|1039|172.16.23.19|161|Deny inbound UDP from 172.16.93.21/1039 to 172.16.23.19/161 on interface inside2
4|Aug 19 2015|09:31:41|500004|172.16.160.32|8240|171.221.115.46|0|Invalid transport field for protocol=UDP, from 172.16.160.32/8240 to 171.221.115.46/0
4|Aug 19 2015|09:31:41|410001|172.16.2.10|53|172.16.168.153|63906|Dropped UDP DNS reply from dmz2:172.16.2.10/53 to inside2:172.16.168.153/63906; packet length 1633 bytes exceeds configured limit of 1024 bytes
4|Aug 19 2015|09:31:41|410001|172.16.2.10|53|172.16.143.14|10930|Dropped UDP DNS reply from dmz2:172.16.2.10/53 to inside2:172.16.143.14/10930; packet length 1521 bytes exceeds configured limit of 1024 bytes
2|Aug 19 2015|09:31:41|106006|172.16.190.65|63900|172.16.5.95|161|Deny inbound UDP from 172.16.190.65/63900 to 172.16.5.95/161 on interface inside2
2|Aug 19 2015|09:31:41|106001|172.16.171.16|3065|172.16.253.5|9999|Inbound TCP connection denied from 172.16.171.16/3065 to 172.16.253.5/9999 flags SYN  on interface inside2
2|Aug 19 2015|09:31:41|106001|172.16.171.123|2471|172.16.253.5|9999|Inbound TCP connection denied from 172.16.171.123/2471 to 172.16.253.5/9999 flags SYN  on interface inside2
4|Aug 19 2015|09:31:40|410001|172.16.176.26|60173|103.28.9.71|53|Dropped UDP DNS request from inside2:172.16.176.26/60173 to outside:103.28.9.71/53; label length 124 bytes exceeds protocol limit of 63 bytes
4|Aug 19 2015|09:31:40|410001|172.16.2.10|53|172.16.172.8|52276|Dropped UDP DNS reply from dmz2:172.16.2.10/53 to inside2:172.16.172.8/52276; packet length 1647 bytes exceeds configured limit of 1024 bytes
4|Aug 19 2015|09:31:40|410001|172.16.2.10|53|172.16.143.18|61412|Dropped UDP DNS reply from dmz2:172.16.2.10/53 to inside2:172.16.143.18/61412; packet length 1647 bytes exceeds configured limit of 1024 bytes
4|Aug 19 2015|09:31:40|410001|172.16.2.10|53|172.16.176.25|54209|Dropped UDP DNS reply from dmz2:172.16.2.10/53 to inside2:172.16.176.25/54209; packet length 1649 bytes exceeds configured limit of 1024 bytes