MSR3020路由器PC机长时间休眠后无法访问外网内网，但可以ping通

最近在用这台路由器的时候，发现个别PC机会出现休眠再打开后无法访问内外网但可以ping通的问题，大家有知道这是什么问题吗？路由器配置放下面了

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 version 5.20, Release 2516P11, Standard
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 sysname Router
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 firewall enable
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 domain default enable system
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 telnet server enable
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 dar p2p signature-file cfa0:/p2p_default.mtd
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 port-security enable
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 ip http port 8080
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 password-recovery enable
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acl number 2000
 rule 0 permit source 172.16.0.0 0.0.255.255
 rule 1 deny
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acl number 4000
 rule 1 permit source-mac 001e-906a-a614 ffff-ffff-ffff
 rule 2 permit source-mac fcaa-14e2-c564 ffff-ffff-ffff
 rule 3 permit source-mac 0030-18a1-dc9a ffff-ffff-ffff
 rule 4 permit source-mac 0025-ab79-0eb2 ffff-ffff-ffff
 rule 120 permit source-mac 6c4b-9027-0d0c ffff-ffff-ffff
 rule 1000 deny
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vlan 1
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domain system
 access-limit disable
 state active
 idle-cut disable
 self-service-url disable
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dhcp server ip-pool pool-2
 network 172.16.0.0 mask 255.255.0.0
 gateway-list 172.16.0.240
 dns-list 202.99.224.68
 expired day 365
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user-group system
 group-attribute allow-guest
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local-user admin
 password cipher $c$3$2hvsDf7r9Ml+C2ZUAko3YJpl/XxcBTo0Pw==
 authorization-attribute level 3
 service-type telnet
 service-type web
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cwmp
 undo cwmp enable
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attack-defense policy 86 interface GigabitEthernet0/0
 signature-detect action drop-packet
 signature-detect fraggle enable
 signature-detect land enable
 signature-detect winnuke enable
 signature-detect tcp-flag enable
 signature-detect icmp-unreachable enable
 signature-detect icmp-redirect enable
 signature-detect tracert enable
 signature-detect smurf enable
 signature-detect source-route enable
 signature-detect route-record enable
 signature-detect large-icmp enable
 defense scan enable
  defense scan add-to-blacklist
 defense syn-flood enable
  defense syn-flood action drop-packet
 defense udp-flood enable
  defense udp-flood action drop-packet
 defense icmp-flood enable
  defense icmp-flood action drop-packet
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attack-defense policy 87 interface GigabitEthernet0/1
 signature-detect action drop-packet
 signature-detect fraggle enable
 signature-detect land enable
 signature-detect winnuke enable
 signature-detect tcp-flag enable
 signature-detect icmp-unreachable enable
 signature-detect icmp-redirect enable
 signature-detect tracert enable
 signature-detect smurf enable
 signature-detect source-route enable
 signature-detect route-record enable
 signature-detect large-icmp enable
 defense scan enable
  defense scan add-to-blacklist
 defense syn-flood enable
  defense syn-flood action drop-packet
 defense udp-flood enable
  defense udp-flood action drop-packet
 defense icmp-flood enable
  defense icmp-flood action drop-packet
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interface Aux0
 async mode flow
 link-protocol ppp
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interface Cellular0/0
 async mode protocol
 link-protocol ppp
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interface Ethernet2/0
 port link-mode route
 shutdown
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interface NULL0
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interface GigabitEthernet0/0
 port link-mode route
 firewall packet-filter 4000 outbound
 nat outbound 2000
 nat server 1 protocol tcp global current-interface www inside 172.16.0.250 www
 nat server 2 protocol tcp global current-interface 8888 inside 172.16.0.254 8888
 nat server 3 protocol tcp global current-interface 888 inside 172.16.1.254 888
 nat server 4 protocol tcp global current-interface 889 inside 172.16.1.252 889
 nat server 5 protocol udp global current-interface 80 inside 172.16.0.250 80
 nat server 6 protocol udp global current-interface 8888 inside 172.16.0.254 8888
 nat server 7 protocol udp global current-interface 888 inside 172.16.1.254 888
 nat server 8 protocol udp global current-interface 889 inside 172.16.1.252 889
 ip address 218.21.242.51 255.255.255.252
 undo dhcp select server global-pool
 attack-defense apply policy 86
 dns server 202.99.224.68
 dns server 202.99.224.8
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interface GigabitEthernet0/1
 port link-mode route
 ip address 172.16.0.240 255.255.0.0
 attack-defense apply policy 87
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 ip route-static 0.0.0.0 0.0.0.0 218.21.242.50
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 dhcp server forbidden-ip 172.16.3.0 172.16.255.255
 dhcp server forbidden-ip 172.16.0.0 172.16.2.100
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 dhcp enable
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 ip https enable
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 load xml-configuration
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 load tr069-configuration
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user-interface con 0
user-interface tty 13
user-interface aux 0
user-interface vty 0 4
 authentication-mode scheme
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return