AC2600 time zone and reboots

My AC2600 is about 2 1/2 years old and recently started rebooting itself for no apparent reason. It seems there is a DoS attack in the logs. Is there anything I can do about that?

The time zone is set to the default, Pacific time and I can find no way to correct it. According to the documentation the setting should be on the advanced/schedule page but it is not there.

[admin login] from source 192.168.2.5, Saturday, April 30, 2022 06:05:33
[DoS Attack: ACK Scan] from source: 185.151.107.101, port 443, Saturday, April 30, 2022 06:01:18

[admin login] from source 192.168.2.5, Saturday, April 30, 2022 05:44:28
[DHCP IP: 192.168.2.10] to MAC address 78:9c:85:16:4b:a9, Saturday, April 30, 2022 05:39:55
[DoS Attack: SYN/ACK Scan] from source: 5.196.22.151, port 80, Saturday, April 30, 2022 05:39:23
[admin login] from source 192.168.2.5, Saturday, April 30, 2022 05:37:37
[DHCP IP: 192.168.2.12] to MAC address d4:4d:a4:c3:f3:8d, Saturday, April 30, 2022 05:37:14
[DHCP IP: 192.168.2.12] to MAC address d4:4d:a4:c3:f3:8d, Saturday, April 30, 2022 05:37:12
[DHCP IP: 192.168.2.154] to MAC address f8:f1:e6:f0:bb:5f, Saturday, April 30, 2022 05:36:55
[DHCP IP: 192.168.2.154] to MAC address f8:f1:e6:f0:bb:5f, Saturday, April 30, 2022 05:36:54
[DHCP IP: 192.168.2.9] to MAC address 78:00:9e:9d:78:c2, Saturday, April 30, 2022 05:35:24
[Time synchronized with NTP server] Saturday, April 30, 2022 05:35:19
[DHCP IP: 192.168.2.104] to MAC address 74:38:b7:0f:20:63, Saturday, April 30, 2022 05:34:49
[DHCP IP: 192.168.2.8] to MAC address 00:05:cd:e8:2c:86, Saturday, April 30, 2022 05:34:48
[DHCP IP: 192.168.2.11] to MAC address d4:4d:a4:6b:dc:63, Saturday, April 30, 2022 05:34:47
[DHCP IP: 192.168.2.11] to MAC address d4:4d:a4:6b:dc:63, Saturday, April 30, 2022 05:34:47
[DHCP IP: 192.168.2.7] to MAC address 0c:ee:99:84:84:23, Saturday, April 30, 2022 05:34:45
[DHCP IP: 192.168.2.118] to MAC address 8c:49:62:13:85:da, Saturday, April 30, 2022 05:34:44
[DHCP IP: 192.168.2.80] to MAC address 48:e1:e9:26:61:49, Saturday, April 30, 2022 05:34:38
[DHCP IP: 192.168.2.80] to MAC address 48:e1:e9:26:61:49, Saturday, April 30, 2022 05:34:37
[DHCP IP: 192.168.2.6] to MAC address 10:3d:0a:2e:c4:3d, Saturday, April 30, 2022 05:34:26
[Internet connected] IP address: 173.63.201.151, Saturday, April 30, 2022 05:34:25
[Initialized, firmware version: V1.0.2.90] Saturday, April 30, 2022 05:34:10