disconnect every few seconds or randomly

although I connect my pc to lan not wifi , the internet disconnect everyseconds some times minutes, I called my ISP , the just change the channel with me but the problem still same ?

and router model is :

NETGEAR PREMIUME EDITION 

N 750 WIRELESS DUAL BAND GIGABIT 

MODEL NO. DGND4000

and this is the log:

[DHCP IP: (192.168.0.4)] to MAC address 30:5A:3A:0F:39:96 Monday, January 30,2017 13:00:42
[DoS attack: ACK Scan] from source: 129.152.38.68:443 Monday, January 30,2017 12:58:30
[DHCP IP: (192.168.0.4)] to MAC address 30:5A:3A:0F:39:96 Monday, January 30,2017 12:57:20
[admin login] from source 192.168.0.4 Monday, January 30,2017 12:55:50
[DoS attack: ACK Scan] from source: 162.247.242.20:443 Monday, January 30,2017 12:55:02
[DHCP IP: (192.168.0.4)] to MAC address 30:5A:3A:0F:39:96 Monday, January 30,2017 12:53:19
[DoS attack: ACK Scan] from source: 162.247.242.20:443 Monday, January 30,2017 12:51:03
[DoS attack: ACK Scan] from source: 162.247.242.20:443 Monday, January 30,2017 12:49:25
[DHCP IP: (192.168.0.4)] to MAC address 30:5A:3A:0F:39:96 Monday, January 30,2017 12:49:21
[DHCP IP: (192.168.0.4)] to MAC address 30:5A:3A:0F:39:96 Monday, January 30,2017 12:47:48
[DHCP IP: (192.168.0.4)] to MAC address 30:5A:3A:0F:39:96 Monday, January 30,2017 12:45:20
[DoS attack: ACK Scan] from source: 42.159.241.204:80 Monday, January 30,2017 12:42:28
[DHCP IP: (192.168.0.4)] to MAC address 30:5A:3A:0F:39:96 Monday, January 30,2017 12:41:19
[DoS attack: RST Scan] from source: 204.79.197.223:80 Monday, January 30,2017 12:39:23
[DoS attack: ACK Scan] from source: 62.128.100.97:443 Monday, January 30,2017 12:37:11
[Time synchronized with NTP server time-g.netgear.com] Monday, January 30,2017 12:35:59
[DHCP IP: (192.168.0.4)] to MAC address 30:5A:3A:0F:39:96 Monday, January 30,2017 12:35:15
[DHCP IP: (192.168.0.4)] to MAC address 30:5A:3A:0F:39:96 Monday, January 30,2017 12:34:45
[DHCP IP: (192.168.0.4)] to MAC address 30:5A:3A:0F:39:96 Monday, January 30,2017 12:34:11
[DHCP IP: (192.168.0.4)] to MAC address 30:5A:3A:0F:39:96 Monday, January 30,2017 12:33:44
[DHCP IP: (192.168.0.4)] to MAC address 30:5A:3A:0F:39:96 Monday, January 30,2017 12:33:20
[Internet connected] IP address: 94.29.200.83 Monday, January 30,2017 12:33:10
[DSL: Up] Monday, January 30,2017 12:33:04
[DSL: Down] Monday, January 30,2017 12:31:35
[Internet disconnected] Monday, January 30,2017 12:31:30
[DHCP IP: (192.168.0.4)] to MAC address 30:5A:3A:0F:39:96 Monday, January 30,2017 12:31:20
[Internet connected] IP address: 94.29.201.251 Monday, January 30,2017 12:28:26
[DHCP IP: (192.168.0.4)] to MAC address 30:5A:3A:0F:39:96 Monday, January 30,2017 12:23:20
[DSL: Up] Monday, January 30,2017 12:18:16
[DHCP IP: (192.168.0.5)] to MAC address EC:1F:72:CA:FC:1B Monday, January 30,2017 12:17:21
[DHCP IP: (192.168.0.4)] to MAC address 30:5A:3A:0F:39:96 Monday, January 30,2017 12:17:08
[DHCP IP: (192.168.0.2)] to MAC address 00:1C:85:0D:49:A8 Monday, January 30,2017 12:16:51
[Initialized, firmware version: V1.1.00.15_1.00.15 ] Monday, January 30,2017 12:16:34