My Linksys wrt 1900acs reboots somewhat frequently, sometimes it can go a week without a reboot and sometimes it can reboot 10 times during the same day, this is what the logread is showing just before the latest reboot
Mon May 27 13:22:58 2019 daemon.info hostapd: wlan1: STA 08:72:02:9d:72:74 IEEE 802.11: authenticated
Mon May 27 13:22:58 2019 kern.debug kernel: [ 5649.395276] ieee80211 phy1: MACREG_REG_INT_CODE: 0x0000
Mon May 27 13:22:58 2019 kern.debug kernel: [ 5649.410307] ieee80211 phy1: MACREG_REG_INT_CODE: 0x0000
Mon May 27 13:22:58 2019 daemon.info hostapd: wlan1: STA 08:72:02:9d:72:74 IEEE 802.11: associated (aid 12)
Mon May 27 13:22:58 2019 kern.debug kernel: [ 5649.462641] ieee80211 phy1: MACREG_REG_INT_CODE: 0x0000
Mon May 27 13:22:58 2019 kern.debug kernel: [ 5649.477043] ieee80211 phy1: MACREG_REG_INT_CODE: 0x0000
Mon May 27 13:22:58 2019 daemon.notice hostapd: wlan1: AP-STA-CONNECTED 08:72:02:9d:72:74
Mon May 27 13:22:58 2019 daemon.info hostapd: wlan1: STA 08:72:02:9d:72:74 WPA: pairwise key handshake completed (RSN)
Mon May 27 13:22:58 2019 daemon.info dnsmasq-dhcp[3145]: DHCPREQUEST(br-lan) 192.168.1.135 08:72:02:9d:72:74
Mon May 27 13:22:58 2019 daemon.info dnsmasq-dhcp[3145]: DHCPACK(br-lan) 192.168.1.135 08:72:02:9d:72:74 iPhone
Mon May 27 13:23:05 2019 kern.alert kernel: [ 5656.437449] Unable to handle kernel paging request at virtual address c02e1ee9
Mon May 27 13:23:05 2019 kern.alert kernel: [ 5656.445103] pgd = dd154000
Mon May 27 13:23:05 2019 kern.alert kernel: [ 5656.447869] [c02e1ee9] *pgd=0021940e(bad)
Mon May 27 13:23:05 2019 kern.emerg kernel: [ 5656.451956] Internal error: Oops: 801 [#1] SMP ARM
Mon May 27 13:23:05 2019 kern.warn kernel: [ 5656.456765] Modules linked in: pppoe ppp_async pppox ppp_generic nf_conntrack_ipv6 iptable_nat ipt_REJECT ipt_MASQUERADE xt_time xt_tcpudp xt_state xt_nat xt_multiport xt_mark xt_mac xt_limit
Mon May 27 13:23:05 2019 kern.warn kernel: [ 5656.516235] CPU: 1 PID: 5979 Comm: tail Not tainted 4.14.95 #0
Mon May 27 13:23:05 2019 kern.warn kernel: [ 5656.522090] Hardware name: Marvell Armada 380/385 (Device Tree)
Mon May 27 13:23:05 2019 kern.warn kernel: [ 5656.528032] task: dedac500 task.stack: dd65e000
Mon May 27 13:23:05 2019 kern.warn kernel: [ 5656.532580] pc : [<c02e1ee0>] lr : [<c02e1624>] psr: 20000013
Mon May 27 13:23:05 2019 kern.warn kernel: [ 5656.538871] sp : dd65fe88 ip : c02e1eb4 fp : 00000001
Mon May 27 13:23:05 2019 kern.warn kernel: [ 5656.544115] r10: 000000c5 r9 : dd65e000 r8 : 00000000
Mon May 27 13:23:05 2019 kern.warn kernel: [ 5656.549360] r7 : 00008180 r6 : 000007ff r5 : dd65ff38 r4 : df241a18
Mon May 27 13:23:05 2019 kern.warn kernel: [ 5656.555913] r3 : 00000001 r2 : df241660 r1 : dd65fe88 r0 : 00000001
Mon May 27 13:23:05 2019 kern.warn kernel: [ 5656.562466] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
Mon May 27 13:23:05 2019 kern.warn kernel: [ 5656.569630] Control: 10c5387d Table: 1d15404a DAC: 00000051
Mon May 27 13:23:05 2019 kern.emerg kernel: [ 5656.575398] Process tail (pid: 5979, stack limit = 0xdd65e210)
Mon May 27 13:23:05 2019 kern.emerg kernel: [ 5656.581254] Stack: (0xdd65fe88 to 0xdd660000)
Mon May 27 13:23:05 2019 kern.emerg kernel: [ 5656.585628] fe80: de31ff10 df241660 dd65fecc c0638fa8 00000000 1f398000
Mon May 27 13:23:05 2019 kern.emerg kernel: [ 5656.593841] fea0: dfbddbc0 00000525 dd65ff30 ffffe000 ffffe000 0000c350 00000000 3b9aca00